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/view/ui/index.ts

@@ -0,0 +1,8 @@
+export * from './slash-items';
+
+export { default as WritekitBubbleMenu } from './WritekitBubbleMenu.vue';
+export type { WritekitBubbleMenuProps } from './WritekitBubbleMenu.vue';
+export { default as WritekitSlashMenu } from './WritekitSlashMenu.vue';
+export type { WritekitSlashMenuProps } from './WritekitSlashMenu.vue';
+export { default as WritekitRemoteCursors } from './WritekitRemoteCursors.vue';
+export type { WritekitRemoteCursorsProps } from './WritekitRemoteCursors.vue';