remove manually vendored raphael library in favor of node module

app/assets/javascripts/lib/raphael.js

-/* eslint-disable func-names, space-before-function-paren */
-
-/*= require raphael */
-/*= require g.raphael */
-/*= require g.bar */
-
-(function() {
-
-}).call(window);

config/application.rb

@@ -100,7 +100,6 @@ module Gitlab
     config.assets.precompile << "katex.js"
     config.assets.precompile << "xterm/xterm.css"
     config.assets.precompile << "lib/ace.js"
-    config.assets.precompile << "lib/raphael.js"
     config.assets.precompile << "u2f.js"
     config.assets.precompile << "vendor/assets/fonts/*"