fix sidebar having homepage linked

Author: LordSimal

docs/.vitepress/toc_en.json

@@ -4,7 +4,6 @@
       "text": "Migrations",
       "collapsed": false,
       "items": [
-        { "text": "Introduction", "link": "/index" },
         { "text": "Writing Migrations", "link": "/writing-migrations" },
         { "text": "Using the Query Builder", "link": "/using-the-query-builder" },
         { "text": "Executing Queries", "link": "/executing-queries" },