Catalog split: federated build, eval enrichment fix, UX improvements

[dmartinol]

Summary

• Federated build: each pack is git cloned from its source repo at build time; marketplace/rh-agentic-collection.yml is the single source of truth
• Eval enrichment fix: removed the second apply_eval_enrichment call in build_website.py that read from the catalog repo root (no eval/ dir there) and silently zeroed out evaluation summaries; eval data is now read only from cloned source repos in generate_pack_data.py. Also added fallback to pack["skills"] for packs without a catalog file
• Dead code removal: removed showPackDetails() (~470 lines) and the dead pack-modal div from app.js/index.html; navigation now uses static collection pages
• Static collection pages (docs/collections/<pack>.html): Skills tab infers skills from SKILL.md frontmatter for un-cataloged packs; GitLab blob URLs use /-/blob/ format; link label simplified to "View SKILL.md →"
• Lola install accordion: packs without deploy_and_use in catalog get a collapsible installation block on the Overview tab
• Stale references cleaned: AGENTS.md, docs/README.md, check_site.py, deploy-pages.yml updated to reflect the catalog-only repo (no more catalog/ dir, catalog/** path trigger, or modal checklist items)
• Eval data location documented: AGENTS.md and README.md now explicitly note that eval/<pack>/<skill>/report.json lives in source repos, not here

Test plan

• make test passes (validate.yml)
• make generate completes without errors and prints eval enrichment per pack
• docs/collections/<pack>.html pages render Skills tab for both cataloged and un-cataloged packs
• GitLab packs (e.g. hummingbird) generate correct /-/blob/ URLs
• Packs without deploy_and_use show the Lola install accordion on the Overview tab
• make serve → site loads, "View Details" navigates to static page, no modal references remain

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