Add Avo engine routes path to the regular `routes.rb` file on install

[adrianthedev]

In order to nto have conflicts in how some link helpers work, we can add this snippet to the parent app on install so users know to use it.

if defined? ::Avo
  Avo::Engine.routes.draw do
    scope :resources do
      get "courses/cities", to: "courses#cities"
      get "users/get_users", to: "users#get_users"
    end
  end
end

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