Upgrade to webpack 5 and all deps

package.json

@@ -44,7 +44,7 @@
     "busboy": "0.3.1",
     "chalk": "4.1.0",
     "cheerio": "1.0.0-rc.3",
-    "commander": "6.1.0",
+    "commander": "6.2.0",
     "express": "4.17.1",
     "file-type": "16.0.0",
     "filenamify": "4.2.0",
@@ -84,40 +84,40 @@
     "cssnano": "4.1.10",
     "dayjs": "1.9.4",
     "emoji-regex": "9.2.0",
-    "eslint": "7.11.0",
-    "eslint-config-prettier": "6.14.0",
+    "eslint": "7.12.1",
+    "eslint-config-prettier": "6.15.0",
     "eslint-plugin-vue": "7.1.0",
     "fuzzy": "0.1.3",
     "husky": "4.3.0",
-    "mini-css-extract-plugin": "1.1.2",
+    "mini-css-extract-plugin": "1.2.1",
     "mocha": "8.2.0",
     "mousetrap": "1.6.5",
     "normalize.css": "8.0.1",
     "npm-run-all": "4.1.5",
     "nyc": "15.1.0",
-    "postcss": "8.1.3",
+    "postcss": "8.1.4",
     "postcss-import": "13.0.0",
     "postcss-loader": "4.0.4",
     "postcss-preset-env": "6.7.0",
     "prettier": "2.1.2",
     "pretty-quick": "3.1.0",
     "primer-tooltips": "2.0.0",
-    "sinon": "9.2.0",
+    "sinon": "9.2.1",
     "socket.io-client": "2.3.1",
     "stylelint": "13.7.2",
     "stylelint-config-standard": "20.0.0",
     "textcomplete": "0.18.2",
     "undate": "0.3.0",
     "vue": "2.6.12",
-    "vue-loader": "15.9.3",
-    "vue-router": "3.4.7",
+    "vue-loader": "15.9.4",
+    "vue-router": "3.4.8",
     "vue-server-renderer": "2.6.12",
     "vue-template-compiler": "2.6.12",
-    "vuedraggable": "2.24.2",
+    "vuedraggable": "2.24.3",
     "vuex": "3.5.1",
-    "webpack": "4.44.2",
-    "webpack-cli": "3.3.12",
-    "webpack-dev-middleware": "3.7.2",
+    "webpack": "5.3.2",
+    "webpack-cli": "4.1.0",
+    "webpack-dev-middleware": "4.0.0",
     "webpack-hot-middleware": "2.25.0"
   },
   "husky": {