add new demo symfony files

app/templates/admin/blog/_delete_form.html.twig

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+{{ include('blog/_delete_post_confirmation.html.twig') }}
+<form action="{{ url('admin_post_delete', {id: post.id}) }}" method="post" data-confirmation="true" id="delete-form">
+    <input type="hidden" name="token" value="{{ csrf_token('delete') }}" />
+    <button type="submit" class="btn btn-lg btn-block btn-danger">
+        <i class="fa fa-trash" aria-hidden="true"></i>
+        {{ 'action.delete_post'|trans }}
+    </button>
+</form>

app/templates/admin/blog/_form.html.twig

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+{#
+    By default, forms enable client-side validation. This means that you can't
+    test the server-side validation errors from the browser. To temporarily
+    disable this validation, add the 'novalidate' attribute:
+
+    {{ form_start(form, {attr: {novalidate: 'novalidate'}}) }}
+#}
+
+{% if show_confirmation|default(false) %}
+    {% set attr = {'data-confirmation': 'true'} %}
+    {{ include('blog/_delete_post_confirmation.html.twig') }}
+{% endif %}
+
+{{ form_start(form, {attr: attr|default({})}) }}
+    {{ form_widget(form) }}
+
+    <button type="submit" class="{{ button_css|default("btn btn-primary") }}">
+        <i class="fa fa-save" aria-hidden="true"></i> {{ button_label|default('label.create_post'|trans) }}
+    </button>
+
+    {% if include_back_to_home_link|default(false) %}
+        <a href="{{ path('admin_post_index') }}" class="btn btn-link">
+            <i class="fa fa-list-alt" aria-hidden="true"></i> {{ 'action.back_to_list'|trans }}
+        </a>
+    {% endif %}
+{{ form_end(form) }}

app/templates/admin/blog/edit.html.twig

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+{% extends 'admin/layout.html.twig' %}
+
+{% block body_id 'admin_post_edit' %}
+
+{% block main %}
+    <h1>{{ 'title.edit_post'|trans({'%id%': post.id}) }}</h1>
+
+    {{ include('admin/blog/_form.html.twig', {
+        form: form,
+        button_label: 'action.save'|trans,
+        include_back_to_home_link: true,
+    }, with_context = false) }}
+{% endblock %}
+
+{% block sidebar %}
+    <div class="section">
+        <a href="{{ path('admin_post_show', {id: post.id}) }}" class="btn btn-lg btn-block btn-success">
+            <i class="fa fa-eye" aria-hidden="true"></i> {{ 'action.show_post'|trans }}
+        </a>
+    </div>
+
+    <div class="section actions">
+        {{ include('admin/blog/_delete_form.html.twig', {post: post}, with_context = false) }}
+    </div>
+
+    {{ parent() }}
+
+    {{ show_source_code(_self) }}
+{% endblock %}

app/templates/admin/blog/index.html.twig

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+{% extends 'admin/layout.html.twig' %}
+
+{% block body_id 'admin_post_index' %}
+
+{% block main %}
+    <h1>{{ 'title.post_list'|trans }}</h1>
+
+    <table class="table table-striped table-middle-aligned">
+        <thead>
+            <tr>
+                <th scope="col">{{ 'label.title'|trans }}</th>
+                <th scope="col"><i class="fa fa-calendar" aria-hidden="true"></i> {{ 'label.published_at'|trans }}</th>
+                <th scope="col" class="text-center"><i class="fa fa-cogs" aria-hidden="true"></i> {{ 'label.actions'|trans }}</th>
+            </tr>
+        </thead>
+        <tbody>
+        {% for post in posts %}
+            <tr>
+                <td>{{ post.title }}</td>
+                {# it's not mandatory to set the timezone in localizeddate(). This is done to
+                   avoid errors when the 'intl' PHP extension is not available and the application
+                   is forced to use the limited "intl polyfill", which only supports UTC and GMT #}
+                <td>{{ post.publishedAt|format_datetime('medium', 'short', '', 'UTC') }}</td>
+                <td class="text-right">
+                    <div class="item-actions">
+                        <a href="{{ path('admin_post_show', {id: post.id}) }}" class="btn btn-sm btn-default">
+                            <i class="fa fa-eye" aria-hidden="true"></i> {{ 'action.show'|trans }}
+                        </a>
+
+                        <a href="{{ path('admin_post_edit', {id: post.id}) }}" class="btn btn-sm btn-primary">
+                            <i class="fa fa-edit" aria-hidden="true"></i> {{ 'action.edit'|trans }}
+                        </a>
+                    </div>
+                </td>
+            </tr>
+        {% else %}
+            <tr>
+                <td colspan="4" align="center">{{ 'post.no_posts_found'|trans }}</td>
+           </tr>
+        {% endfor %}
+        </tbody>
+    </table>
+{% endblock %}
+
+{% block sidebar %}
+    <div class="section actions">
+        <a href="{{ path('admin_post_new') }}" class="btn btn-lg btn-block btn-success">
+            <i class="fa fa-plus" aria-hidden="true"></i> {{ 'action.create_post'|trans }}
+        </a>
+    </div>
+
+    {{ parent() }}
+
+    {{ show_source_code(_self) }}
+{% endblock %}

app/templates/admin/blog/new.html.twig

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+{% extends 'admin/layout.html.twig' %}
+
+{% block body_id 'admin_post_new' %}
+
+{% block main %}
+    <h1>{{ 'title.post_new'|trans }}</h1>
+
+    {{ form_start(form) }}
+        {{ form_row(form.title) }}
+        {{ form_row(form.summary) }}
+        {{ form_row(form.content) }}
+        {{ form_row(form.publishedAt) }}
+        {{ form_row(form.tags) }}
+
+        <button type="submit" class="btn btn-primary">
+            <i class="fa fa-save" aria-hidden="true"></i> {{ 'label.create_post'|trans }}
+        </button>
+        {{ form_widget(form.saveAndCreateNew, {label: 'label.save_and_create_new', attr: {class: 'btn btn-primary'}}) }}
+        <a href="{{ path('admin_post_index') }}" class="btn btn-link">
+            <i class="fa fa-list-alt" aria-hidden="true"></i> {{ 'action.back_to_list'|trans }}
+        </a>
+    {{ form_end(form) }}
+{% endblock %}
+
+{% block sidebar %}
+    {{ parent() }}
+
+    {{ show_source_code(_self) }}
+{% endblock %}

app/templates/admin/blog/show.html.twig

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+{% extends 'admin/layout.html.twig' %}
+
+{% block body_id 'admin_post_show' %}
+
+{% block main %}
+    <h1>{{ post.title }}</h1>
+
+    <p class="post-metadata">
+        <span class="metadata"><i class="fa fa-calendar"></i> {{ post.publishedAt|format_datetime('long', 'medium', '', 'UTC') }}</span>
+        <span class="metadata"><i class="fa fa-user"></i> {{ post.author.fullName }}</span>
+    </p>
+
+    <div class="well">
+        <p class="m-b-0"><strong>{{ 'label.summary'|trans }}</strong>: {{ post.summary }}</p>
+    </div>
+
+    {{ post.content|markdown_to_html|sanitize_html }}
+
+    {{ include('blog/_post_tags.html.twig') }}
+{% endblock %}
+
+{% block sidebar %}
+    <div class="section">
+        <a href="{{ path('admin_post_edit', {id: post.id}) }}" class="btn btn-lg btn-block btn-success">
+            <i class="fa fa-edit" aria-hidden="true"></i> {{ 'action.edit_contents'|trans }}
+        </a>
+    </div>
+
+    <div class="section">
+        {{ include('admin/blog/_delete_form.html.twig', {post: post}, with_context = false) }}
+    </div>
+
+    {{ parent() }}
+
+    {{ show_source_code(_self) }}
+{% endblock %}

app/templates/admin/layout.html.twig

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+{#
+   This is the base template of the all backend pages. Since this layout is similar
+   to the global layout, we inherit from it to just change the contents of some
+   blocks. In practice, backend templates are using a three-level inheritance,
+   showing how powerful, yet easy to use, is Twig's inheritance mechanism.
+   See https://symfony.com/doc/current/templates.html#template-inheritance-and-layouts
+#}
+{% extends 'base.html.twig' %}
+
+{% block stylesheets %}
+    {{ parent() }}
+    {{ encore_entry_link_tags('admin') }}
+{% endblock %}
+
+{% block header_navigation_links %}
+    <li>
+        <a href="{{ path('admin_post_index') }}">
+            <i class="fa fa-list-alt" aria-hidden="true"></i> {{ 'menu.post_list'|trans }}
+        </a>
+    </li>
+    <li>
+        <a href="{{ path('blog_index') }}">
+            <i class="fa fa-home" aria-hidden="true"></i> {{ 'menu.back_to_blog'|trans }}
+        </a>
+    </li>
+{% endblock %}
+
+{% block javascripts %}
+    {{ parent() }}
+    {{ encore_entry_script_tags('admin') }}
+{% endblock %}