Small homepage improvements

server/utils/routeHelpers.js

@@ -8,6 +8,10 @@ export function blogUrl(): string {
   return 'https://medium.com/getoutline';
 }
 
+export function twitterUrl(): string {
+  return 'https://twitter.com/getoutline';
+}
+
 export function developers(): string {
   return '/developers';
 }