Sitemap improvements

[pjaclark]

Add:

• priority
  • set in front matter as sitemap.priority
  • highest of:
  • 0.1 for old versions:
    • KV 2.0.x, 2.1.x, 2.2.x
    • CS 2.0.x
    • TS 1.0.x, 1.1.x, 1.2.x, 1.3.x, 1.4.x
  • 0.2 for LTS old versions:
    • KV 2.9.x, 3.0.x, 3.2.x
    • CS 2.1.x, 3.0.x
    • TS 1.5.x, 3.0.x
  • 0.3 for LTS best of old versions:
    • KV 2.9.10
    • CS 2.1.2
    • TS 1.5.2
  • 0.5 for other pages:
    • community
  • 0.9 for for LTS best of versions:
    • KV 3.0.16, 3.2.0
    • CS 3.0.1
    • TS 3.0.0
• last mod date
  • set in front matter as lastmod in format 2022-06-10T00:00:00-00:00
  • use tag date from GitHub for each release date
• frequency: do not set; allow override in front matter

Examples: https://www.webnots.com/beginners-guide-to-sitemap/