Remove two unused top level dependencies

1. brace-expansion seems to have been added in order to fix a
vulnerability, this is not strictly necessary, as it requires a newer
version in our yarn.lock file. Original commit:
https://gitlab.com/gitlab-org/gitlab/-/commit/e6adc5088ffe4e844f63f68542049b5df6cd10f9
2. fontawesome is unused

package.json

@@ -63,7 +63,6 @@
     "babel-loader": "^8.2.2",
     "babel-plugin-lodash": "^3.3.4",
     "bootstrap": "4.4.1",
-    "brace-expansion": "^1.1.8",
     "cache-loader": "^4.1.0",
     "clipboard": "^1.7.1",
     "codemirror": "^5.48.4",
@@ -90,7 +89,6 @@
     "exports-loader": "^0.7.0",
     "fast-mersenne-twister": "1.0.2",
     "file-loader": "^5.1.0",
-    "font-awesome": "4.7.0",
     "fuzzaldrin-plus": "^0.6.0",
     "graphql": "^15.4.0",
     "graphql-tag": "^2.11.0",

yarn.lock

@@ -2432,7 +2432,7 @@ boxen@^4.2.0:
     type-fest "^0.8.1"
     widest-line "^3.1.0"
 
-brace-expansion@^1.1.7, brace-expansion@^1.1.8:
+brace-expansion@^1.1.7:
   version "1.1.11"
   resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.11.tgz#3c7fcbf529d87226f3d2f52b966ff5271eb441dd"
   integrity sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==
@@ -5265,11 +5265,6 @@ follow-redirects@^1.0.0, follow-redirects@^1.10.0:
   resolved "https://registry.yarnpkg.com/follow-redirects/-/follow-redirects-1.13.0.tgz#b42e8d93a2a7eea5ed88633676d6597bc8e384db"
   integrity sha512-aq6gF1BEKje4a9i9+5jimNFIpq4Q1WiwBToeRK5NvZBd/TRsmW8BsJfOEGkr76TbOyPVD3OVDN910EcUNtRYEA==
 
-font-awesome@4.7.0:
-  version "4.7.0"
-  resolved "https://registry.yarnpkg.com/font-awesome/-/font-awesome-4.7.0.tgz#8fa8cf0411a1a31afd07b06d2902bb9fc815a133"
-  integrity sha1-j6jPBBGhoxr9B7BtKQK7n8gVoTM=
-
 for-in@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/for-in/-/for-in-1.0.2.tgz#81068d295a8142ec0ac726c6e2200c30fb6d5e80"