feat: Add PostsController and configure routes

- Added a new file `PostsController.php` in the `app/Http/Controllers` directory.
- Implemented the `index()` method to retrieve all posts using the Sheets facade.
- Implemented the `show()` method to display a single post using route model binding with Sheets.
- Updated the `RouteServiceProvider.php` file to bind the 'post' route parameter to retrieve posts from the Sheets collection.
- Created a new configuration file `sheets.php` in the `config` directory, defining default settings for collections and their corresponding sheet classes, path parsers, content parsers, and extensions.
- Added a new markdown file `hello-world.md` in the `content/posts` directory as an example post.
- Created two new blade view files: `index.blade.php` and `show.blade.php`, under the `resources/views/posts` directory, for displaying lists of posts and individual post details respectively.
- Modified the existing web routes (`web.php`) to include routes for accessing posts.

The changes enable users to view all posts on `/posts`, as well as access individual post details at `/post/{post}`.

routes/web.php

@@ -4,6 +4,7 @@ use App\Http\Controllers\AboutController;
 use App\Http\Controllers\AssetsController;
 use App\Http\Controllers\ChampionController;
 use App\Http\Controllers\FAQController;
+use App\Http\Controllers\PostsController;
 use App\Http\Controllers\SaleController;
 use App\Http\Controllers\SummonerEmoteController;
 use Illuminate\Support\Facades\Route;
@@ -76,6 +77,17 @@ Route::get('/about/faq/heimerdinger', [
     'heimerdinger'
 ])->name('about.faq.heimerdinger');
 
+// Posts
+Route::get('/posts', [
+    PostsController::class,
+    'index'
+])->name('posts.index');
+
+Route::get('/post/{post}', [
+    PostsController::class,
+    'show'
+])->name('posts.show');
+
 // Pulse
 Route::get(config('app.login_route'), function () {
     return redirect('/pulse');