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/features-sidebar.html

@@ -0,0 +1,22 @@
+<div class="docs-sidebar bg-transparent shadow-sm rounded-lg p-4 sticky top-20 mt-2">
+  <h3 class="text-lg font-semibold mb-3 mt-1">{{ i18n "features" }}</h3>
+  <nav class="docs-nav">
+    <ul class="space-y-1">
+      {{ range (where .Site.Pages "Section" .Section).ByWeight }}
+        {{ if and .Title (not .IsHome) (ne .Kind "section") }}
+        <li>
+          <a href="{{ .RelPermalink }}"
+             class="block px-4 py-2 rounded-md transition-colors duration-200
+                    {{ if eq .RelPermalink $.RelPermalink }}
+                      bg-primary-100 text-primary-500 font-medium
+                    {{ else }}
+                      text-gray-700 hover:bg-gray-50 hover:text-gray-900
+                    {{ end }}">
+            {{ .Title }}
+          </a>
+        </li>
+        {{ end }}
+      {{ end }}
+    </ul>
+  </nav>
+</div>