Move install instructions into per-skill docs and remove single INSTALL doc

README.md

@@ -16,7 +16,6 @@ ai-coding-skills/
 ├── README.md
 ├── docs/
 │   ├── README.md
-│   ├── INSTALL.md
 │   ├── CREATE-PLAN.md
 │   └── WEB-AUTOMATION.md
 ├── skills/
@@ -51,7 +50,8 @@ ai-coding-skills/
 | web-automation | opencode | Playwright + Camoufox browsing/scraping/auth automation | Ready | [WEB-AUTOMATION](docs/WEB-AUTOMATION.md) |
 
 - Docs index: `docs/README.md`
-- Install guide: `docs/INSTALL.md`
+- Create-plan guide: `docs/CREATE-PLAN.md`
+- Web-automation guide: `docs/WEB-AUTOMATION.md`
 
 ## Compatibility Policy