docs: repoint tui.md skin reference to features/skins.md

The example-skin.yaml was removed as part of the stale docs cleanup.
Docusaurus features/skins.md covers the same material.

Also update AUTHOR_MAP for balyan.sid@gmail.com → alt-glitch (actual
GitHub login; balyansid returns 404).

scripts/release.py

@@ -150,7 +150,7 @@ AUTHOR_MAP = {
     "jack.47@gmail.com": "JackTheGit",
     "dalvidjr2022@gmail.com": "Jr-kenny",
     "m@statecraft.systems": "mbierling",
-    "balyan.sid@gmail.com": "balyansid",
+    "balyan.sid@gmail.com": "alt-glitch",
     "oluwadareab12@gmail.com": "bennytimz",
     "simon@simonmarcus.org": "simon-marcus",
     "xowiekk@gmail.com": "Xowiek",