feat(code): switch to CodeMirror 6

packages/codemirror/src/index.ts

@@ -1 +1,13 @@
-export * from './lib/codemirror.js';
+import { defaultKeymap } from "@codemirror/commands";
+import { EditorView, keymap, type EditorViewConfig } from "@codemirror/view";
+
+export default class CodeMirror extends EditorView {
+    constructor(config: EditorViewConfig) {
+        super({
+            ...config,
+            extensions: [
+                keymap.of(defaultKeymap)
+            ]
+        });
+    }
+}

packages/codemirror/src/lib/codemirror.ts

@@ -1,3 +0,0 @@
-export function codemirror(): string {
-  return 'codemirror';
-}