add form to doc generation and custom form to admin template configuration

src/Bundle/ChillDocGeneratorBundle/Resources/views/Admin/DocGeneratorTemplate/pick-context.html.twig

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+{% extends '@ChillDocGenerator/Admin/layout.html.twig' %}
+
+{% block title 'Pick template context'|trans %}
+
+{% block layout_wvm_content %}
+<div class="col-md-10 col-xxl">
+
+    <h1>{{ block('title') }}</h1>
+   <div class="container">
+       {% for key, context in contexts %}
+            <div class="row">
+                <div class="col-md-4">
+                    <a
+                        href="{{ path('chill_crud_docgen_template_new', { 'context': key }) }}"
+                        class="btn btn-outline-chill-green-dark">
+                        {{ context.name|trans }}
+                    </a>
+                </div>
+                <div class="col-md-8">
+                   {{ context.description|trans|nl2br }}
+                </div>
+            </div>
+       {% endfor %}
+   </div>
+</div>
+
+{% endblock %}

src/Bundle/ChillDocGeneratorBundle/Resources/views/Generator/basic_form.html.twig

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+{% extends 'ChillMainBundle::layout.html.twig' %}
+
+{% block title 'Generate document'|trans %}
+
+{% block content %}
+<div class="col-md-10 col-xxl">
+    <h1>{{ block('title') }}</h1>
+
+    {{ form_start(form, { 'attr': { 'id': 'generate_doc_form' }}) }}
+    {{ form(form) }}
+    {{ form_end(form) }}
+
+    <ul class="record_actions sticky-form-buttons">
+        <li>
+            <button type="submit" class="btn btn-edit" form="generate_doc_form">
+                <i class="fa fa-cog"></i> {{ 'Generate'|trans }}
+            </button>
+        </li>
+    </ul>
+</div>
+{% endblock %}