chore(vercel): add redirects for framework slugs to their overview

Author: brandyscarney

vercel.json

@@ -1,6 +1,10 @@
 {
   "redirects": [
     { "source": "/", "destination": "/docs" },
+    {
+      "source": "/docs/angular",
+      "destination": "/docs/angular/overview"
+    },
     {
       "source": "/docs/angular/your-first-app/2-taking-photos",
       "destination": "/docs/angular/your-first-app/taking-photos"
@@ -36,6 +40,10 @@
     },
     { "source": "/docs/next/:match*", "destination": "/docs/:match*" },
     { "source": "/docs/v8/:match*", "destination": "/docs/:match*" },
+    {
+      "source": "/docs/react",
+      "destination": "/docs/react/overview"
+    },
     {
       "source": "/docs/react/your-first-app/2-taking-photos",
       "destination": "/docs/react/your-first-app/taking-photos"
@@ -57,6 +65,10 @@
       "destination": "/docs/react/your-first-app/deploying-mobile"
     },
     { "source": "/docs/react/your-first-app/7-live-reload", "destination": "/docs/react/your-first-app/live-reload" },
+    {
+      "source": "/docs/vue",
+      "destination": "/docs/vue/overview"
+    },
     { "source": "/docs/vue/your-first-app/2-taking-photos", "destination": "/docs/vue/your-first-app/taking-photos" },
     { "source": "/docs/vue/your-first-app/3-saving-photos", "destination": "/docs/vue/your-first-app/saving-photos" },
     { "source": "/docs/vue/your-first-app/4-loading-photos", "destination": "/docs/vue/your-first-app/loading-photos" },