feat(contact): add ContactSubmissionController and contact form view

- Added ContactSubmissionController with index and store methods for handling contact submissions.
- Created a new Blade view for the contact form with fields for name, email, discord, category, subject, and message.
- Updated routes to include endpoints for displaying the contact form and submitting it.

app/Http/Controllers/ContactSubmissionController.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Http\Requests\ContactSubmissionRequest;
+use App\Models\ContactSubmission;
+
+class ContactSubmissionController extends Controller
+{
+    public function index()
+    {
+        return view('contact.index');
+    }
+
+    public function store(ContactSubmissionRequest $request)
+    {
+        $contactSubmission = ContactSubmission::create($request->validated());
+
+        return redirect()->route('contact.index')->with('success', 'Your message has been sent!');
+    }
+}