Update scaffold to ship HW-Module-CI wrappers; retire sync infrastructure

[peterus]

Summary

Update HW-Module-Template scaffold to the new shared-CI world. Anyone clicking "Use this template" now gets a module that's pre-wired to OE5XRX/HW-Module-CI@main.

Changes:

• 3 workflow YAMLs replaced with thin wrappers that uses: OE5XRX/HW-Module-CI/...@main
• Deleted file-sync infrastructure (.github/workflows/sync.yaml, .github/sync.yml) — the BetaHuhn/repo-file-sync-action workflow is FULLY RETIRED across the OE5XRX HW ecosystem
• Deleted scripts/, Gemfile, *.kibot.yaml, doc/_config.yml, doc/favicon.ico, doc/Icon.png — all CI assets live in HW-Module-CI
• doc/index.md: scaffold uses Liquid {{ site.data.project.name }} for artefact paths (preserved <NAME> placeholders)
• README.md: rewritten — new scaffold model, points users at HW-Module-CI for internals
• .gitignore: exclude CI-generated doc/_data/project.yml

This is the LAST PR in the HW-Module-CI rollout — after merge, every HW repo (5 modules + DebugBoard + template) is on the new world and BetaHuhn/repo-file-sync-action is fully retired.

Test Plan

Template has no .kicad_pro, so the wrapper workflows would fail if triggered (auto-detection finds zero .kicad_pro). Intentional — Template isn't a consumer.

• Manual review of doc/index.md scaffold (Liquid templating + <NAME> placeholders intact)
• Manual review of README.md (new scaffold model documented)

[Copilot]

Pull request overview

Updates the HW-Module-Template scaffold to the new shared CI model by removing local CI/config infrastructure and replacing it with thin GitHub Actions wrappers that call reusable workflows from OE5XRX/HW-Module-CI.

Changes:

• Replaced local GitHub Actions workflow implementations with reusable-workflow wrappers (uses: OE5XRX/HW-Module-CI/...).
• Removed retired sync + local CI assets (repo-file-sync workflow/config, KiBot YAMLs, Ruby/Jekyll/Gemfile, scripts).
• Updated documentation scaffold (README.md, doc/index.md) and ignored CI-generated doc/_data/project.yml.

Reviewed changes

Copilot reviewed 13 out of 16 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
.github/workflows/kibot-check.yaml	Replaced local KiBot check job with reusable workflow wrapper.
.github/workflows/create-debug-docs.yaml	Replaced local debug docs pipeline with reusable workflow wrapper.
.github/workflows/create-release-docs.yaml	Replaced local release docs pipeline with reusable workflow wrapper.
.github/workflows/sync.yaml	Removed retired repo file-sync workflow.
.github/sync.yml	Removed retired repo-file-sync configuration.
README.md	Rewrote template documentation to describe shared CI model and module setup steps.
doc/index.md	Switched artefact paths to use {{ site.data.project.name }} for auto-detected basenames.
.gitignore	Ignored CI-generated doc/_data/project.yml.
Gemfile	Removed local Jekyll/Ruby dependencies (now owned by shared CI).
doc/_config.yml	Removed local Jekyll config (now owned by shared CI).
test.kibot.yaml	Removed local KiBot check config (now owned by shared CI).
production.kibot.yaml	Removed local production KiBot config (now owned by shared CI).
scripts/requirements.txt	Removed script dependency list (scripts retired from template).
scripts/bom-export.py	Removed InvenTree BOM export script (now owned by shared CI).

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