Add Forgejo-backed editor

package.json

@@ -36,7 +36,13 @@
   },
   "dependencies": {
     "@clack/prompts": "^0.11.0",
+    "@codemirror/commands": "^6.10.3",
+    "@codemirror/lang-markdown": "^6.5.0",
+    "@codemirror/language": "^6.12.2",
+    "@codemirror/state": "^6.6.0",
+    "@codemirror/view": "^6.40.0",
     "@floating-ui/dom": "^1.7.4",
+    "@lezer/highlight": "^1.2.3",
     "@myriaddreamin/rehype-typst": "^0.6.0",
     "@napi-rs/simple-git": "0.1.22",
     "@tweenjs/tween.js": "^25.0.0",
@@ -44,6 +50,7 @@
     "async-mutex": "^0.5.0",
     "chokidar": "^5.0.0",
     "cli-spinner": "^0.2.10",
+    "codemirror": "^6.0.2",
     "d3": "^7.9.0",
     "esbuild-sass-plugin": "^3.6.0",
     "flexsearch": "^0.8.205",