Add live Markdown editing, colours and files in the tree

Frontend/package.json

@@ -13,6 +13,7 @@
     "react-dom": "^18.3.1",
     "@uiw/react-codemirror": "^4.23.0",
     "@codemirror/view": "^6.34.1",
+    "@codemirror/language": "^6.10.3",
     "@codemirror/lang-markdown": "^6.2.5",
     "@codemirror/lang-html": "^6.4.9",
     "@codemirror/lang-json": "^6.0.1",