Avoid downloading individual Font Awesome icons

Font Awesome is included in Semantic UI, so we no longer need
to download icons directly.
Deleted includes/fontawesome/README.md.
Removed script downloading them from package.json.

package.json

@@ -14,11 +14,9 @@
     "webpack-cli": "^3.1.2"
   },
   "scripts": {
-    "test": "test",
     "build": "webpack --mode=production",
     "dev": "webpack --mode=development",
-    "clean": "rm -rf build;",
-    "icons": "curl https://raw.githubusercontent.com/encharm/Font-Awesome-SVG-PNG/master/black/svg/question-circle-o.svg -o source/common/includes/fontawesome/question-circle-o.svg && curl https://raw.githubusercontent.com/encharm/Font-Awesome-SVG-PNG/master/black/svg/caret-down.svg -o source/common/includes/fontawesome/caret-down.svg && curl https://raw.githubusercontent.com/encharm/Font-Awesome-SVG-PNG/master/black/svg/caret-right.svg -o source/common/includes/fontawesome/caret-right.svg && curl https://raw.githubusercontent.com/encharm/Font-Awesome-SVG-PNG/master/black/svg/check.svg -o source/common/includes/fontawesome/check.svg && curl https://raw.githubusercontent.com/encharm/Font-Awesome-SVG-PNG/master/black/svg/lock.svg -o source/common/includes/fontawesome/lock.svg && curl https://raw.githubusercontent.com/encharm/Font-Awesome-SVG-PNG/master/black/svg/unlock.svg -o source/common/includes/fontawesome/unlock.svg && curl https://raw.githubusercontent.com/encharm/Font-Awesome-SVG-PNG/master/black/svg/exclamation-triangle.svg -o source/common/includes/fontawesome/exclamation-triangle.svg"
+    "clean": "rm -rf build"
   },
   "repository": {
     "type": "git",

source/common/includes/fontawesome/README.md

-The icons in this folder were originally developed by 
-[*Font Awesome*](https://fontawesome.com/) 
-and licensed under the Creative Commons Attribution 4.0 International license,
-see details [here](https://fontawesome.com/license). The actual files are 
-downloaded from [Font-Awesome-SVG-PNG](https://github.com/encharm/Font-Awesome-SVG-PNG).
\ No newline at end of file