Revert "Upgrade to Font Awesome 5"

client/package.json

@@ -22,6 +22,7 @@
     "debug": "3.1.0",
     "filesize": "3.5.11",
     "filter-invalid-dom-props": "2.0.0",
+    "font-awesome": "4.7.0",
     "immutable": "3.8.2",
     "json-stable-stringify": "1.0.1",
     "lcp": "1.1.0",
@@ -48,7 +49,6 @@
     "xterm": "3.3.0"
   },
   "devDependencies": {
-    "@fortawesome/fontawesome-free": "^5.5.0",
     "autoprefixer": "7.1.5",
     "babel-cli": "6.26.0",
     "babel-core": "6.26.0",