Add html-loader, file-loader, and clean-webpack-plugin

- Added html-loader to automatically require the files we reference in img tags
- Added file-loader to handle the svg,png,jpg,gif files from our images
- Configured file-loader to add our images to an imgs directory in dist
- Also configured it to add a hash to their filenames
- Lastly, added clean-webpack-plugin to our production config to clean out the dist directory each time we build

package.json

@@ -14,6 +14,8 @@
   "devDependencies": {
     "bootstrap": "^4.3.1",
     "css-loader": "^2.1.0",
+    "file-loader": "^3.0.1",
+    "html-loader": "^0.5.5",
     "html-webpack-plugin": "^3.2.0",
     "node-sass": "^4.11.0",
     "sass-loader": "^7.1.0",
@@ -22,5 +24,8 @@
     "webpack-cli": "^3.2.3",
     "webpack-dev-server": "^3.2.1",
     "webpack-merge": "^4.2.1"
+  },
+  "dependencies": {
+    "clean-webpack-plugin": "^2.0.0"
   }
 }