Use webpack to deliver newest ACE editor

With this commit, we change the delivery method for the ACE editor from manually copied files to using yarn and webpack. As a side-change, we also modify how the mode is selected through JavaScript instead of Ruby.

Through webpack, the `modePath`, `themePath`, and `workerPath` are automatically determined and working as expected.

Closes #250

package.json

@@ -14,6 +14,7 @@
     "@sentry/integrations": "^7.108.0",
     "@sentry/utils": "^7.108.0",
     "@webpack-cli/serve": "^2.0.5",
+    "ace-builds": "^1.32.6",
     "babel-loader": "^9.1.3",
     "bootstrap": "^5.3.3",
     "bootswatch": "^5.3.3",