Feature flags (#543)

* Re-organize a bit controllers

* Added the featureflagcontroller

* Implement feature flags in the front-end

* Clean env files

* Clean console.log messages

* Fix feature flag test

api/app/Http/Controllers/Content/FontsController.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Http\Controllers\Content;
+
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Http;
+use App\Http\Controllers\Controller;
+
+class FontsController extends Controller
+{
+    public function index(Request $request)
+    {
+        if (!config('services.google.fonts_api_key')) {
+            return response()->json([]);
+        }
+
+        return \Cache::remember('google_fonts', 60 * 60, function () {
+            $url = "https://www.googleapis.com/webfonts/v1/webfonts?sort=popularity&key=" . config('services.google.fonts_api_key');
+            $response = Http::get($url);
+            if ($response->successful()) {
+                $fonts = collect($response->json()['items'])->filter(function ($font) {
+                    return !in_array($font['category'], ['monospace']);
+                })->map(function ($font) {
+                    return $font['family'];
+                })->toArray();
+                return response()->json($fonts);
+            }
+
+            return [];
+        });
+    }
+}