feat(writekit): rename @robonen/editor to @robonen/writekit

Rename the rich-text editor package and all Editor* exports to Writekit*;
remove the old vue/editor tree.

vue/writekit/src/blocks/code-block.ts

@@ -0,0 +1,16 @@
+import type { Node } from '../model';
+import { defineBlock } from '../registry';
+
+export const codeBlock = defineBlock({
+  type: 'code-block',
+  spec: {
+    content: { kind: 'text', marks: 'none' }, // raw text, no inline formatting
+    group: 'block',
+    code: true, // Enter inserts a newline instead of splitting
+    defining: true,
+    attrs: { language: { default: 'plain' } },
+    toDOM: (node: Node) => ['pre', { 'data-language': String(node.attrs['language'] ?? 'plain') }, 0],
+    parseDOM: [{ tag: 'pre' }],
+  },
+  meta: { title: 'Code block', icon: 'code', keywords: ['code', 'pre', 'snippet'], group: 'basic' },
+});