chore: update docs scaffolding for v6 elements

[zeroedin]

Phase 0.3: Update docs scaffolding

Part of the v6 migration (#3110). The docs site references v5 element names throughout and needs updating for v6.

Files with v5 references

• docs/index.html — uses pf-v5-card, pf-v5-progress-stepper, pf-v5-clipboard-copy, pf-v5-tabs, pf-v5-tab, pf-v5-tab-panel
• docs/components.md — references pf-v5-tabs in JS
• docs/_snippets/ — framework integration snippets reference v5 element names (e.g., accordion-html.md, accordion-jsx.md, etc.)
• docs/framework-integration/ — integration examples likely reference v5 names
• docs/components/ — component doc templates

Tasks

• Update docs/index.html to use pf-v6-* element names
• Update docs/components.md to reference pf-v6-tabs
• Update docs/_snippets/*.md with v6 element names and APIs
• Update docs/framework-integration/ examples for v6
• Update docs/components/ templates for v6
• Verify docs build still works after changes

Notes

• This is not blocking element migration work but should be done before the v6 release
• Can be done incrementally as v6 elements are ported, or as a batch

Related

• Migration plan: .claude/V6-MIGRATION-PLAN.md (Phase 0.3)
• Parent issue: [epic] Port v5 elements to v6 #3110