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/env.d.ts

@@ -0,0 +1,13 @@
+export {};
+
+declare global {
+  const __DEV__: boolean;
+}
+
+declare module 'vue' {
+  type ComponentCustomProps = Record<`data${string}`, unknown>;
+}
+
+declare module 'vue' {
+  type HTMLAttributes = Record<`data-${string}`, unknown>;
+}