Move editing the vote description to a dedicated page

So that /votes/:id remains a preview page, even for organizers.

vedia.rb

@@ -298,6 +298,14 @@ get '/votes/:id' do
   end
 end
 
+get '/votes/:id/edit' do
+  require_login
+  find_vote
+  require_organizer
+  require_draft_vote
+  erb :votes_edit_description
+end
+
 post '/votes/:id/edit' do
   require_login
   find_vote
@@ -306,7 +314,7 @@ post '/votes/:id/edit' do
   @vote.title = params[:title]
   @vote.description = params[:description]
   @vote.save
-  erb :votes_edit
+  redirect '/votes/' + @vote.secure_id
 end
 
 post '/votes/:id/candidates' do