docs: rewrite comparison as JVM-only with verified sources

Complete rewrite of comparison page:
- Focus exclusively on JVM packaging tools (11 tools)
- Remove all non-JVM tools (Electron, Tauri, Flutter, Python, etc.)
- Add source links for every factual claim (official docs, GitHub, vendor pages)
- Verify Conveyor against v21.1 docs: correct platform coverage (no Linux ARM64,
  no macOS universal), add Maven/CLI support, detail all signing providers
- Recompute all scores with sum/130×100 formula verified by script
- Add collapsible "Sources" sections after each comparison table
- Update tool versions: install4j 12.0.2, Conveyor 21.1, jDeploy 6.0.16,
  Compose MP 1.10.1, badass-jlink 3.2.1, JavaPackager 1.7.6

Author: kdroidFilter