Fix some rehydration errors due to nested <a> tags

Author: techniq

docs/src/routes/docs/showcase/+page.md

@@ -11,10 +11,12 @@
 
 <Showcase sites={featuredSites} />
 
-## [Supporters](https://github.com/techniq/layerchart?tab=readme-ov-file#sponsors)
+## Supporters
 
 <Showcase sites={supporterSites} />
 
+[Become a sponsor](https://github.com/techniq/layerchart?tab=readme-ov-file#sponsors)
+
 ## Popular
 
 <Showcase sites={popularSites} />
@@ -23,4 +25,4 @@
 
 <Showcase sites={otherSites} />
 
-## [More](https://github.com/techniq/layerchart/network/dependents)
+[View all dependents on GitHub](https://github.com/techniq/layerchart/network/dependents)