Render skill SKILL.md files as website pages and link to them

[d-morrison]

Summary

• Add skills/*/SKILL.md glob to _quarto.yml render list so each skill renders as its own page on the website
• Link every skill name in the skills.qmd category tables to its rendered page
• Link skill mentions in workflow.qmd to the corresponding skill pages

Closes #240

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Generated by Claude Code

[d-morrison]

ARD summary

• Address — linked post-merge and ums in the merge-it sentence in workflow.qmd (commit 252a48b).
• Defer — alias SKILL.md files referencing canonical paths as bare filesystem text (not Quarto cross-references) is pre-existing and out of scope here; filing a follow-up issue.

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Generated by Claude Code

[claude]

Claude finished @d-morrison's task in 51s —— View job

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Code Review — PR #241 (confirming review)

• Gather context and understand the request
• Check fix for post-merge and ums links in workflow.qmd
• Verify no new issues introduced
• Post confirming review

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Verdict: Clean — prior findings fully addressed

Commit 252a48b applies exactly the fix requested in the prior review: workflow.qmd line 94 now links both post-merge and ums using the same relative-path format as the other five skill mentions on the page:

The [`merge-it`](skills/merge-it/SKILL.md) skill chains `merge-it` → [`post-merge`](skills/post-merge/SKILL.md) → [`ums`](skills/ums/SKILL.md) automatically when you say "merge it".

Both skills/post-merge/SKILL.md and skills/ums/SKILL.md exist in the repo — no dead links introduced.

The deferred item (alias SKILL.md files referencing canonical paths as bare text) is appropriately tracked as a follow-up and outside this PR's scope.

No new issues found. The prior verdict — one minor nit, otherwise looks good — now stands as fully clean.