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/tutorials/ai-assistance-guide.md

@@ -96,7 +96,6 @@ BlumeOps operations are driven by mise tasks. Run `mise tasks` to list all avail
 | `tailnet-up` | Apply Tailscale ACL changes via Pulumi |
 | `docs-check-links` | Validate wiki-links in documentation (includes orphan detection) |
 | `docs-check-index` | Check every doc is referenced in its category index |
-| `docs-check-titles` | Check for duplicate doc titles |
 | `docs-check-filenames` | Check for duplicate doc filenames |
 | `docs-review-stale` | Report docs by last-modified date, highlight stale ones |
 | `docs-review-tags` | Print frontmatter tag inventory across all docs |