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/keymap/index.ts

@@ -0,0 +1,5 @@
+export * from './types';
+export * from './normalize';
+export * from './compile';
+export * from './defaults';
+export * from './dispatcher';