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'.

api/page.go

@@ -89,6 +89,7 @@ func NewPageRouter() http.Handler {
 		r.Use(IsLoggedInMiddleware)
 		r.Get("/register-confirm", GetRegisterConfirmPage)
 		r.Get("/home", GetHomePage)
+		r.Get("/posts", GetPostsPage)
 	})
 
 	return r