Use mfm-js for MFM parsing (#7415)

* wip

* Update mfm.ts

* wip

* update mfmjs

* refactor

* nanka

* Update mfm.ts

* Update to-html.ts

* Update to-html.ts

* wip

* fix test

* fix test

package.json

@@ -180,6 +180,7 @@
 		"markdown-it": "12.0.4",
 		"markdown-it-anchor": "7.1.0",
 		"matter-js": "0.16.1",
+		"mfm-js": "0.12.0",
 		"mocha": "8.3.2",
 		"moji": "0.5.1",
 		"ms": "2.1.3",
@@ -190,7 +191,6 @@
 		"object-assign-deep": "0.4.0",
 		"os-utils": "0.0.14",
 		"parse5": "6.0.1",
-		"parsimmon": "1.16.0",
 		"pg": "8.5.1",
 		"portscanner": "2.2.0",
 		"postcss": "8.2.8",