Add angle bracket covered url syntax to mfm (#4483)

* Add angle bracket covered url syntax to mfm

* Fix path

* Fix match

* Fix index

src/mfm/parse.ts

@@ -1,5 +1,5 @@
 import { mfmLanguage } from './language';
-import { MfmForest } from './types';
+import { MfmForest } from './prelude';
 import { normalize } from './normalize';
 
 export function parse(source: string): MfmForest {