Fix CORS and Mixed-Content issue & Bug Fixes

This fixes the following issues:
- Text selection color was incorrect
- The 'send again' button glitched on page load

This also adds some finishing touches to the proxy code (closes #199)
and that in turn resolves #175 and resolves #2

Finally, this adds the fonts to the application assets allowing
them to be cached by the service worker.

nuxt.config.js

@@ -265,8 +265,9 @@ export default {
   },
   toast: {
     position: 'bottom-center',
-    duration: 2000,
-    theme: 'bubble'
+    duration: 3000,
+    theme: 'bubble',
+    keepOnHover: true
   },
   googleAnalytics: {
     id: process.env.GA_ID || 'UA-61422507-2'