Refactor file and URL paths in docusaurus (#11080)

* Fix introduction link

* Restore staking guide pages

* Remove Edit this page link

* Fix broken wallet guide link

* Restore lost images

* Fixup URL paths to match gitbook style

* Refactor wallet guide READMEs and clean up URLs

* Remove lingering gitbook files

* Refactor all README files to keep consistent linking

* Updte homepage tile links

Co-authored-by: publish-docs.sh <maintainers@solana.com>

docs/src/integrations/exchange.md

@@ -93,7 +93,7 @@ curl -X POST -H "Content-Type: application/json" -d '{"jsonrpc": "2.0","id":1,"m
 
 You may wish to keep the keys for one or more collection accounts offline for
 greater security. If so, you will need to move SOL to hot accounts using our
-[offline methods](../offline-signing/README.md).
+[offline methods](../offline-signing.md).
 
 ## Listening for Deposits