Add bot icon to bot avatars and migrate to newer version of Font Awesome (#8484)

* Migrate to newer version of Font Awesome

* Add bot icon to bot avatars

package.json

@@ -37,6 +37,7 @@
     "@babel/preset-env": "^7.0.0",
     "@babel/preset-react": "^7.0.0",
     "@babel/runtime": "^7.0.0",
+    "@fortawesome/fontawesome-free": "^5.2.0",
     "array-includes": "^3.0.3",
     "autoprefixer": "^8.6.5",
     "axios": "~0.16.2",
@@ -58,7 +59,6 @@
     "exif-js": "^2.3.0",
     "express": "^4.16.2",
     "file-loader": "^2.0.0",
-    "font-awesome": "^4.7.0",
     "glob": "^7.1.1",
     "history": "^4.7.2",
     "http-link-header": "^0.8.0",