Update editor layout. add delete line button

editor-build/entry.js

@@ -6,7 +6,7 @@
 // :root CSS variables so there are no hardcoded colors/spacing here.
 import { EditorState, EditorSelection, Compartment, Prec } from "@codemirror/state";
 import { EditorView, keymap, drawSelection } from "@codemirror/view";
-import { history, historyKeymap, defaultKeymap, indentWithTab, undo, redo } from "@codemirror/commands";
+import { history, historyKeymap, defaultKeymap, indentWithTab, undo, redo, deleteLine } from "@codemirror/commands";
 import { markdown, markdownLanguage, markdownKeymap } from "@codemirror/lang-markdown";
 import { syntaxHighlighting, HighlightStyle, indentOnInput } from "@codemirror/language";
 import {
@@ -91,6 +91,7 @@ window.CM = {
     indentWithTab,
     undo,
     redo,
+    deleteLine,
     markdown,
     markdownLanguage,
     markdownKeymap,