Refactor theme colors and styles; remove unused favicon; update translations and layouts

- Deleted unused favicon file.
- Updated Tailwind CSS configuration to redefine primary and secondary colors.
- Adjusted button styles in CSS to use new color definitions.
- Removed English translations and added French translations for various UI elements.
- Created new layouts for features and updated existing layouts to reflect new design.
- Modified header and CTA components to use updated color scheme.
- Cleaned up pricing table shortcode to align with new styles.
- Updated theme metadata to reflect new author and project details.

themes/chill-theme/layouts/partials/components/docs-sidebar.html

@@ -0,0 +1,86 @@
+<div class="docs-sidebar bg-white shadow-sm rounded-lg p-4 sticky top-20 mt-2">
+  <h3 class="text-lg font-semibold text-gray-900 mb-3 mt-1">{{ i18n "documentation" }}</h3>
+  <nav class="docs-nav">
+    <ul class="space-y-1">
+      {{/* Get all docs pages */}}
+      {{ $docsPages := where .Site.Pages "Section" "docs" }}
+      {{ $docsPages = where $docsPages ".IsHome" false }}
+
+      {{/* Build list of all section directories to check against */}}
+      {{ $sectionDirs := slice }}
+      {{ range $docsPages }}
+        {{ if eq .Kind "section" }}
+          {{ $sectionDirs = $sectionDirs | append .File.Dir }}
+        {{ end }}
+      {{ end }}
+
+      {{/* Build top-level items: pages directly in docs/ AND first-level sections */}}
+      {{ $topLevel := slice }}
+      {{ range $docsPages }}
+        {{ $dir := .File.Dir }}
+
+        {{/* For sections: include if NOT the root "docs/" section */}}
+        {{ if eq .Kind "section" }}
+          {{ if ne $dir "docs/" }}
+            {{/* This is a first-level section like "concepts/", "react/", "backend/" */}}
+            {{ $topLevel = $topLevel | append . }}
+          {{ end }}
+        {{ else if eq .Kind "page" }}
+          {{/* For pages: only include if Dir is exactly "docs/" (top-level pages) */}}
+          {{ if eq $dir "docs/" }}
+            {{ $topLevel = $topLevel | append . }}
+          {{ end }}
+        {{ end }}
+      {{ end }}
+
+      {{/* Display top-level items sorted by weight */}}
+      {{ range sort $topLevel "Weight" }}
+        {{ if .Title }}
+        <li>
+          <a href="{{ .RelPermalink }}"
+             class="block px-4 py-2 rounded-md transition-colors duration-200
+                    {{ if eq .RelPermalink $.RelPermalink }}
+                      bg-indigo-50 text-indigo-600 font-medium
+                    {{ else }}
+                      text-gray-700 hover:bg-gray-50 hover:text-gray-900
+                    {{ end }}">
+            {{ .Title }}
+          </a>
+
+          {{/* If this is a section, show its children */}}
+          {{ if eq .Kind "section" }}
+            {{ $sectionDir := .File.Dir }}
+            {{ $children := slice }}
+
+            {{/* Find child pages in this section (same directory, but .Kind is "page" not "section") */}}
+            {{ range $docsPages }}
+              {{ if and (eq .Kind "page") (eq .File.Dir $sectionDir) }}
+                {{ $children = $children | append . }}
+              {{ end }}
+            {{ end }}
+
+            {{/* Display children if any exist */}}
+            {{ if $children }}
+            <ul class="ml-4 mt-1 space-y-1">
+              {{ range sort $children "Weight" }}
+              <li>
+                <a href="{{ .RelPermalink }}"
+                   class="block px-3 py-1.5 text-sm rounded-md transition-colors duration-200
+                          {{ if eq .RelPermalink $.RelPermalink }}
+                            bg-indigo-50 text-indigo-600 font-medium
+                          {{ else }}
+                            text-gray-600 hover:bg-gray-50 hover:text-gray-900
+                          {{ end }}">
+                  {{ .Title }}
+                </a>
+              </li>
+              {{ end }}
+            </ul>
+            {{ end }}
+          {{ end }}
+        </li>
+        {{ end }}
+      {{ end }}
+    </ul>
+  </nav>
+</div>