Shorten rendered links (strip protocol and www, truncate to 30 chars), redirect

to sign in page after sign up instead of root path which redirects to /about

spec/lib/formatter_spec.rb

@@ -17,7 +17,7 @@ RSpec.describe Formatter do
     end
 
     it 'contains a link' do
-      expect(subject).to match('<a rel="nofollow noopener" href="http://google.com">http://google.com</a>')
+      expect(subject).to match('<a rel="nofollow noopener" href="http://google.com">google.com</a>')
     end
   end