feat(docs): add keymap upgrader

Added a documentation page with a script that upgrades deprecated key
codes and behaviors to their replacements.

Fixes #299

docs/package.json

@@ -21,9 +21,11 @@
     "@fortawesome/react-fontawesome": "^0.1.12",
     "classnames": "^2.2.6",
     "react": "^16.8.4",
+    "react-async": "^10.0.1",
     "react-copy-to-clipboard": "^5.0.2",
     "react-dom": "^16.8.4",
-    "react-toastify": "^6.0.9"
+    "react-toastify": "^6.0.9",
+    "web-tree-sitter": "^0.17.1"
   },
   "browserslist": {
     "production": [
@@ -42,6 +44,8 @@
     "eslint-config-prettier": "^6.14.0",
     "eslint-plugin-mdx": "^1.8.2",
     "eslint-plugin-react": "^7.21.5",
-    "prettier": "2.1.2"
+    "null-loader": "^3.0.0",
+    "prettier": "2.1.2",
+    "string-replace-loader": "2.3"
   }
 }