chore: gitignore superpowers docs directory

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Skiipy11

.gitignore

@@ -5,5 +5,6 @@ node_modules/
 data/
 tmp/
 .claude/
+docs/superpowers/
 Gemini Images/
 Notebooklm/