chore: update vercel link (#1775)

* chore: update vercel link

Author: sy-records

README.md

@@ -126,4 +126,4 @@ This project exists thanks to all the people who contribute. [[Contribute](CONTR
 
 _Vercel_ has given us a Pro account.
 
-<a href="https://vercel.com/?utm_source=docsifyjsdocs" target="_blank"><img src="docs/_media/vercel_logo.svg" width="100px"></a>
+<a href="https://vercel.com/?utm_source=docsifyjs&utm_campaign=oss" target="_blank"><img src="docs/_media/vercel_logo.svg" width="100px"></a>

docs/README.md

@@ -35,4 +35,4 @@ Users and the development team are usually in the [Discord server](https://disco
 
 _Vercel_ has given us a Pro account.
 
-<a href="https://vercel.com/?utm_source=docsifyjsdocs" target="_blank"><img src="https://cdn.jsdelivr.net/gh/docsifyjs/docsify/docs/_media/vercel_logo.svg" width="100px"></a>
+<a href="https://vercel.com/?utm_source=docsifyjs&utm_campaign=oss" target="_blank"><img src="https://cdn.jsdelivr.net/gh/docsifyjs/docsify/docs/_media/vercel_logo.svg" width="100px"></a>

docs/index.html

@@ -204,7 +204,7 @@
                 }
                 return (
                   html +
-                  '<br/> <i>Vercel</i> has given us a Pro account <br/> <a href="https://vercel.com/?utm_source=docsifyjsdocs" target="_blank"><img src="https://cdn.jsdelivr.net/gh/docsifyjs/docsify/docs/_media/vercel_logo.svg" alt="Vercel" width="100" height="64"></a>'
+                  '<br/> <i>Vercel</i> has given us a Pro account <br/> <a href="https://vercel.com/?utm_source=docsifyjs&utm_campaign=oss" target="_blank"><img src="https://cdn.jsdelivr.net/gh/docsifyjs/docsify/docs/_media/vercel_logo.svg" alt="Vercel" width="100" height="64"></a>'
                 );
               });
           },