Add rake task to run the server

.env.example

 PROD_HOSTNAME=
 VLV_USERNAME=
 VLV_PASSWORD=
+SESSION_KEY=
+SESSION_DOMAIN=
+SESSION_SECRET=

Rakefile

 require 'dotenv/load'
 
+task 'server' do
+  require_relative './web/server'
+
+  VLVSearch.run!
+end
+
 task 'migrate' do
   require_relative './db/migrate'
 

web/server.rb

       Truncato.truncate(s, max_length: 500)
     end
   end
-
-  run! if __FILE__ == $0
 end