Fix webpack build warnings (#13752)

Turns out some of the dependencies make use of optional dependencies
like the vue-template-compiler. Install them again and install
fomantic-ui only when it's being build to fix webpack warnings.

package.json

@@ -52,9 +52,6 @@
     "worker-loader": "3.0.5",
     "wrap-ansi": "7.0.0"
   },
-  "optionalDependencies": {
-    "fomantic-ui": "2.8.7"
-  },
   "devDependencies": {
     "eslint": "7.14.0",
     "eslint-plugin-html": "6.1.1",