Add documentation export to single HTML and PDF files

[Copilot]

Enables exporting Bnd documentation to offline formats (single HTML or PDF) for archival, distribution, and offline access across different versions.

Implementation

Export scripts:

• export-single-html.sh - Combines all Jekyll-generated pages into single HTML with embedded TOC and print-friendly CSS
• export-pdf.sh - Converts to PDF using auto-detected tools (wkhtmltopdf > weasyprint > chromium), falls back to HTML with manual conversion instructions
• export-release.sh - Exports from releases/ directory without requiring Jekyll rebuild

Content extraction:

• Python HTMLParser extracts main content from multiple documentation structures:
  • Just-the-docs theme: <main id="main-content">
  • Legacy _site structure: <main data-pagefind-body>
  • Release structure: <div class="notes-margin">
• Priority-based selection ensures accurate content extraction
• Preserves document order: index, introduction, chapters, instructions, macros, commands, headers, tools, plugins
• Handles nested HTML structures with depth tracking
• Properly excludes navigation bars and sidebars in all structures

Documentation:

• EXPORT_README.md - User guide with installation, usage, troubleshooting
• USAGE_EXAMPLES.md - 10 practical examples covering all workflows
• IMPLEMENTATION_SUMMARY.md - Technical details

Compatibility:

• ✅ Just-the-docs Jekyll theme (current documentation)
• ✅ Legacy custom Jekyll templates
• ✅ Archived release documentation

Usage

# Export archived release (no build required)
./export-release.sh 7.0.0      # → bnd-docs-7.0.0.html (1.7 MB)
./export-release.sh 7.0.0 pdf  # → bnd-docs-7.0.0.pdf (995 KB)

# Export current development version
./build.sh
./export-single-html.sh master
./export-pdf.sh master

Tested with 7.0.0 release: 443 pages → 1.7MB HTML / 995KB PDF in <30s.

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[peterkir]

@copilot
Review the doc updates to Just-the-docs templates and assure that export still works and nav bar is considered in html and pdf exports.

[Copilot]

@copilot
Review the doc updates to Just-the-docs templates and assure that export still works and nav bar is considered in html and pdf exports.

I've updated the export scripts to support the Just-the-docs theme migration (commit fe3f10c).

Changes made:

• Enhanced HTML parser to recognize Just-the-docs structure (<main id="main-content">)
• Maintained backward compatibility with legacy templates and release documentation
• Added priority-based content extraction for accurate parsing

Tested compatibility:
✅ Just-the-docs theme (current): <main id="main-content">
✅ Legacy _site structure: <main data-pagefind-body>
✅ Release documentation: <div class="notes-margin">

The navigation bar is properly excluded from exports in all structures - the parser specifically targets main content areas and ignores nav/sidebar elements.

[peterkir]

@copilot
Review and validate that described tools and processes are still working
move the exports scripts and howtos to a separte subfolder _export
create a chapter inside documentation under "documentation and tools" describing how to use them - reuse created doc

[peterkir]

https://gh.io/copilot-coding-agent-docs
Review and validate that described tools and processes are still working
move the exports scripts and howtos to a separate subfolder docs/_export
create a chapter inside documentation under "documentation and tools" describing how to use them - reuse created doc