feat: initial itpp-docs setup with MkDocs Material

- mkdocs.yml with dark slate theme, nav for 12 ITPP projects
- build-docs.sh aggregates docs from all project repos
- .gitea/workflows/docs-publish.yml for nightly rebuild+deploy
- README and CHANGELOG for the itpp-docs repo itself
- docs-source/ populated from all 12 repos
- site/ ready for deployment to docs.itpropartner.com

docs-source/index.md

@@ -0,0 +1,26 @@
+# IT Pro Partner Documentation
+
+Welcome to the IT Pro Partner centralized documentation site.
+
+## Projects
+
+| Project | Description | Repo |
+|---|---|---|
+| [ITPP Infrastructure](itpp-infrastructure/) | Server inventory, DNS, architecture | [Repo](https://git.itpropartner.com/ippadmin/itpp-infrastructure) |
+| [ITPP Standards](itpp-standards/) | Documentation standards & templates | [Repo](https://git.itpropartner.com/ippadmin/itpp-standards) |
+| [TransitPin](transitpin/) | White-label transportation portal | [Repo](https://git.itpropartner.com/ippadmin/transitpin) |
+| [HomeLab](homelab/) | Home lab infrastructure automation | [Repo](https://git.itpropartner.com/ippadmin/homelab) |
+| [Scripts](scripts/) | Operations and automation scripts | [Repo](https://git.itpropartner.com/ippadmin/scripts) |
+| [FleetTracker360](fleettracker360/) | GPS fleet tracking platform | [Repo](https://git.itpropartner.com/ippadmin/fleettracker360) |
+| [Shark Game](shark-game/) | Shark Attack Fantasy League | [Repo](https://git.itpropartner.com/ippadmin/shark-game) |
+| [VerdictTank](verdicttank/) | Product review and validation platform | [Repo](https://git.itpropartner.com/ippadmin/verdicttank) |
+| [Apex Track](apex-track/) | Track event management | [Repo](https://git.itpropartner.com/ippadmin/apex-track) |
+| [BoxPilot](boxpilot/) | Logistics operations platform | [Repo](https://git.itpropartner.com/ippadmin/boxpilot) |
+| [OSINT Tool](osint-tool/) | OSINT people search & skip tracing | [Repo](https://git.itpropartner.com/ippadmin/osint-tool) |
+| [LaunchCheck](launchcheck/) | Startup validation SaaS | [Repo](https://git.itpropartner.com/ippadmin/launchcheck) |
+
+## About
+
+This site is auto-generated by [mkdocs-material](https://squidfunk.github.io/mkdocs-material/)
+from source repositories hosted on [Gitea](https://git.itpropartner.com/).
+Rebuilt nightly via Gitea Actions.