Remove legacy annotations route

We forgot to remove it in commit 54e59a8a5. We were getting an exception
on production when accessing the `/annotations/search` route because of
it.

config/routes.rb

@@ -4,7 +4,6 @@ Rails.application.routes.draw do
 
   draw :account
   draw :admin
-  draw :annotation
   draw :budget
   draw :comment
   draw :community

config/routes/annotation.rb

@@ -1,3 +0,0 @@
-resources :annotations do
-  get :search, on: :collection
-end