Rename block .editor files to .config

Also drop the color and leftSideBarVisible overrides from PageEditor.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014xjLo7mFxZXfPDCHuKX4Dz

components/page-editor.tsx

@@ -41,8 +41,6 @@ export default function PageEditor({ pagePath, page }: PageEditorProps) {
   return (
     <Editor
       theme="light"
-      color="teal"
-      ui={{ leftSideBarVisible: false }}
       config={appConfig as any}
       data={data}
       plugins={plugins}