Webpack 5 support with updated packages (#131)

- Update to Webpack 5
- Use @effortlessmotion dynamic html and inline source plugins
- Remove .clasp.json and use SAMPLE file
- Consistent prettier formatting throughout
- Update packages to latest versions

Co-authored-by: Kevin Malakoff <kmalakoff@gmail.com>

.eslintrc.json

@@ -10,5 +10,10 @@
     "import/no-extraneous-dependencies": "warn",
     "prefer-object-spread": "warn",
     "spaced-comment":"off"
+  },
+  "parserOptions": {
+    "babelOptions": {
+      "configFile": "./dev/.babelrc"
+    }
   }
 }