docs: point the badge snippet at commit-check.com/badge.svg

commit-check.com now serves the badge (commit-check/commit-check.com#46),
so the snippet a user copies is one line instead of a 519-character
shields.io URL with the mark base64-encoded into it. The badge shown
above the snippet is the hosted one as well, so it shows exactly what
the user will get.

Author: shenxianpeng

README.md

@@ -290,10 +290,10 @@ a read-only token by default. The `pull-requests: write` grant in the
 
 ## Show that you use it
 
-[![commit-check](https://img.shields.io/badge/commit--check-enabled-2c9ccd?labelColor=0b1620&logo=data:image/svg%2bxml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCA2NCA2NCI%2bPHBhdGggZD0iTTIxIDM0TDMwIDQzTDQ3IDIyIiBmaWxsPSJub25lIiBzdHJva2U9IiMyQzlDQ0QiIHN0cm9rZS13aWR0aD0iOCIgc3Ryb2tlLWxpbmVjYXA9InJvdW5kIiBzdHJva2UtbGluZWpvaW49InJvdW5kIi8%2bPGNpcmNsZSBjeD0iMjEiIGN5PSIzNCIgcj0iNyIgZmlsbD0iIzBCMTYyMCIgc3Ryb2tlPSIjMkM5Q0NEIiBzdHJva2Utd2lkdGg9IjUiLz48L3N2Zz4K)](https://commit-check.com)
+[![commit-check](https://commit-check.com/badge.svg)](https://commit-check.com)
 
 ```text
-[![commit-check](https://img.shields.io/badge/commit--check-enabled-2c9ccd?labelColor=0b1620&logo=data:image/svg%2bxml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCA2NCA2NCI%2bPHBhdGggZD0iTTIxIDM0TDMwIDQzTDQ3IDIyIiBmaWxsPSJub25lIiBzdHJva2U9IiMyQzlDQ0QiIHN0cm9rZS13aWR0aD0iOCIgc3Ryb2tlLWxpbmVjYXA9InJvdW5kIiBzdHJva2UtbGluZWpvaW49InJvdW5kIi8%2bPGNpcmNsZSBjeD0iMjEiIGN5PSIzNCIgcj0iNyIgZmlsbD0iIzBCMTYyMCIgc3Ryb2tlPSIjMkM5Q0NEIiBzdHJva2Utd2lkdGg9IjUiLz48L3N2Zz4K)](https://commit-check.com)
+[![commit-check](https://commit-check.com/badge.svg)](https://commit-check.com)
 ```
 
 ## Versioning and feedback