feat: migrate Hugo Bootstrap theme to latest Hugo with Tailwind CSS and refactor codebase

* replace Bootstrap-based styling with Tailwind CSS
* update theme compatibility for latest Hugo version
* refactor templates and partials
* fix outdated code and broken components
* improve project structure and maintainability
* optimize styling and frontend build setup

exampleSite/config/development/server.toml

@@ -0,0 +1,13 @@
+# defaultContentLanguageInSubdir must be true for this to work.
+
+# Other languages redirects
+# [[redirects]]
+# from = '/fr/**'
+# to = '/fr/404.html'
+# status = 404
+
+# Default language must be last.
+# [[redirects]]
+# from = '/**'
+# to = '/en/404.html'
+# status = 404