Stop using webdrivers

selenium-webdriver provides all that is needed now

Author: jcoyne

example_app_generator/generate_app.rb

@@ -31,8 +31,6 @@
   # sqlite3 is an optional, unspecified, dependency and Rails 6.0 only supports `~> 1.4`
   gsub_file "Gemfile", /.*gem..sqlite3.*/, "gem 'sqlite3', '~> 1.4'"
 
-  gsub_file "Gemfile", /.*chromedriver-helper.*/, "gem 'webdrivers'"
-
   if RUBY_ENGINE == "jruby"
     gsub_file "Gemfile", /.*jdbc.*/, ''
   end