chore: update documentation in readme.md

Removed placeholder text and added link to the official docs for clarity.

Author: barelyhuman

adex/readme.md

@@ -69,16 +69,7 @@ And you are done.
 
 ## Docs
 
-> TBD
-
-- Basic
-- Font
-- Islands
-
-> [!NOTE]
->
-> Refer to the `playground` in the source repo or the default template to
-> understand how to write apps with adex
+[Docs →](https://barelyhuman.github.io/adex-docs/)
 
 ## License