Remove reference to non-existing file

src/search-editor/hooks/useInitializeDoc.ts

@@ -7,17 +7,13 @@ import { useEffect } from 'react';
 import { EMPTY_PARAGRAPH_NODE, RemirrorJSON } from 'remirror';
 import { ParagraphExtension } from 'remirror/extensions';
 
-import { CustomKeymapExtension } from '../../extensions/custom-keymap-extension';
 import { MentionExtension } from '../../extensions/mention-extension';
 
 export function useInitializeDoc(props: {
 	getContext: () =>
 		| ReactFrameworkOutput<
 				ReactExtensions<
-					| ParagraphExtension
-					| CustomKeymapExtension
-					| PlaceholderExtension
-					| MentionExtension
+					ParagraphExtension | PlaceholderExtension | MentionExtension
 				>
 		  >
 		| undefined;