Remove title slug check and test duplicate titles (#116)

## Summary
- Remove `docs-check-titles` pre-commit hook and mise task — wiki-links resolve by filename stem, not frontmatter title, so slug-format titles and uniqueness aren't needed
- Add two test cards (`title-test-alpha`, `title-test-beta`) with identical `title: Title Test Card` to verify duplicate titles don't break Quartz or obsidian.nvim
- Retitle `index.md` from `blumeops-documentation` to `BlumeOps`
- Add GitHub and Forgejo repo links to homepage intro

## Test plan
- [ ] Deploy to docs site and verify both test cards render and cross-link correctly
- [ ] Verify homepage title renders as "BlumeOps"
- [ ] Verify repo links on homepage work
- [ ] After confirming, remove test cards in a follow-up

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Reviewed-on: https://forge.ops.eblu.me/eblume/blumeops/pulls/116

docs/reference/reference.md

@@ -46,6 +46,7 @@ Host inventory and network configuration.
 - [[tailscale]] - ACLs, groups, tags
 - [[gandi]] - DNS hosting for `eblu.me`
 - [[routing|Routing]] - DNS domains, port mappings
+- [[title-test-alpha]] / [[title-test-beta]] - Duplicate title test (temporary)
 
 ## Kubernetes