feat: Posts page impl and associated routes

Implemented a new 'Posts' page which has been added to the main navigation. This includes:
- Adding the 'posts.html' template with basic HTML and related CSS/JS
- Updating the 'componentNavbar.html' template to include a link to the new Posts page
- Writing the 'GetPostsPage' function in 'api/page.go' to handle requests for the Posts page
- Modifying the 'home.html' template to provide a link towards the Posts Page
- Adding an associated route in 'api/page.go'.

adapters/secondary/gateways/web/templates/componentNavbar.html

@@ -16,10 +16,7 @@
 					<a class="nav-link" href="/home">Accueil</a>
 				</li>
 				<li class="nav-item">
-					<a class="nav-link" href="#">Link 2</a>
-				</li>
-				<li class="nav-item">
-					<a class="nav-link" href="#">Link 3</a>
+					<a class="nav-link" href="/posts">Posts</a>
 				</li>
 			</ul>
 			<ul class="navbar-nav">