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/apex-track/CHANGELOG.md

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+# Apex Track Experience — CHANGELOG
+
+## 2026-07-10 — Initial
+
+- Created project repository and directory structure.

docs-source/apex-track/index.md

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+# apex-track
+
+
+> **Owner:** Germaine | **Status:** PLANNED
+> **Last Updated:** 2026-08-09
+
+Apex Track is a track event and racing experience management platform. Designed for track day organizers, racing clubs, and motorsport venues to manage event scheduling, participant registration, timing and scoring, and live results publishing.
+
+## Tech Stack
+
+- TBD — architecture and stack decisions pending
+
+## Quick Start
+
+```bash
+git clone https://git.itpropartner.com/ippadmin/apex-track.git
+cd apex-track
+# Project in early planning phase — implementation to follow
+```
+
+## Related
+
+- [itpp-infrastructure](https://git.itpropartner.com/ippadmin/itpp-infrastructure) — server inventory, DNS
+- [itpp-standards](https://git.itpropartner.com/ippadmin/itpp-standards) — docs standards and templates