Migrate to Yarn & Parcel (#260)

* Switch from npm to yarn
* Add minimum viable parcel dev server config
* Remove webpack configs
* Update docker build, build w/ yarn on node 16.x

ui/package.json

@@ -4,30 +4,29 @@
   "license": "MIT",
   "private": true,
   "scripts": {
-    "clean": "rm -rf dist elm-stuff",
-    "build": "webpack --mode production",
-    "watch": "webpack --mode development --watch",
-    "dev": "webpack-dev-server --mode development --port 3000 --hot --watch",
-    "errors": "webpack --mode development --display-error-details"
+    "build": "parcel build",
+    "start": "parcel --hmr-port 1235 src/index-dev.html",
+    "clean": "rm -rf .parcel-cache dist elm-stuff"
   },
-  "dependencies": {
-    "opensans-npm-webfont": "^1.0.0"
+  "source": "src/index.html",
+  "parcel-namer-rewrite": {
+    "rules": {
+      "(.*)\\.(css|js|json|eot|png|svg|ttf|webmanifest|woff|woff2)": "static/$1{.hash}.$2"
+    }
   },
+  "browserslist": "defaults",
+  "dependencies": {},
   "devDependencies": {
-    "@babel/core": "^7.14.8",
-    "@babel/preset-env": "^7.14.8",
     "@fortawesome/fontawesome-free": "^5.15.3",
+    "@parcel/packager-raw-url": "2.4.1",
+    "@parcel/transformer-elm": "^2.2.1",
+    "@parcel/transformer-webmanifest": "2.4.1",
     "@webcomponents/webcomponentsjs": "^2.5.0",
-    "babel-loader": "^8.2.2",
-    "css-loader": "^4.3.0",
-    "elm-hot-webpack-loader": "^1.1.8",
-    "elm-webpack-loader": "^7.0.1",
-    "file-loader": "^6.2.0",
-    "html-webpack-plugin": "^4.5.2",
-    "node-elm-compiler": "^5.0.6",
-    "style-loader": "^1.3.0",
-    "webpack": "^4.46.0",
-    "webpack-cli": "^3.3.12",
-    "webpack-dev-server": "^3.11.2"
+    "opensans-npm-webfont": "^1.0.0",
+    "parcel": "^2.4.1",
+    "parcel-namer-rewrite": "^2.0.0-rc.2"
+  },
+  "optionalDependencies": {
+    "elm": "^0.19.1-5"
   }
 }