SEO & PWA (#1)

* Initial SEO test

* Canonical URL added using envs

* OG & Twitter fix

* Robots.txt & meta added

* Localhost support for canonical url

* Initial PWA version

* Icons reexported & added maskable

next.config.js

@@ -0,0 +1,7 @@
+const withPWA = require("next-pwa");
+
+module.exports = withPWA({
+    pwa: {
+        dest: "public"
+    }
+});