Fix blog link (#935)

* v7 blog post

* remove links

* fix broken link

site/blog/2024-9-26-gasket-v7.md

@@ -96,6 +96,5 @@ flexibility than ever before.
 Follow the [Upgrade Guide] today and explore the new features and improvements
 that make Gasket v7 the best version yet. Happy coding!
 
-[releases]: releases.md
-[Upgrade Guide]: upgrade-to-7.md
+[Upgrade Guide]: /docs/upgrade-to-7
 [github repo]: https://github.com/godaddy/gasket