Update error views

resources/views/errors/400.blade.php

@@ -0,0 +1,10 @@
+@extends('layouts.app')
+
+@section('content')
+<div class="container">
+  <div class="error-page py-5 my-5 text-center">
+    <h3 class="font-weight-bold">Sorry, this page isn't available.</h3>
+    <p class="lead">The link you followed may be broken, or the page may have been removed. <a href="/">Go back to Pixelfed.</a></p>
+  </div>
+</div>
+@endsection

resources/views/errors/403.blade.php

@@ -0,0 +1,10 @@
+@extends('layouts.app')
+
+@section('content')
+<div class="container">
+  <div class="error-page py-5 my-5 text-center">
+    <h3 class="font-weight-bold">Sorry, this page isn't available.</h3>
+    <p class="lead">The link you followed may be broken, or the page may have been removed. <a href="/">Go back to Pixelfed.</a></p>
+  </div>
+</div>
+@endsection