steps towards release 2.2

[Omikhleia]

Tentatively planned Oct. 7, 2023

Decisions

• [x] Do I have time to address #58
  • Lots of co-dependent releases are needed (see below) for 2.2.0
  • This item only depends on resilient and could be postponed if needed

Checklist:

• [x] Smoke tests with latest dev versions
• [x] Prepare release notes for all affected modules
• [x] Tag and release silex.sile 0.3.0
• [x] Tag and release textsubsuper.sile 1.1.0
• [x] Tag and release markdown.sile 1.5.0
• [x] Tag and release resilient.sile 2.2.0
• [x] Update silex.sile on Luarocks
• [x] Update texstsubsuper on Luarocks
• [x] Update markdown.sile on Luarocks
• [x] Update resilient.sile on Luarocks
• [x] Rebuild resilient docker image with latest versions
• [x] Regenerate markdown manual and push to GDrive + Calaméo
• [x] Regenerate resilient manual and push to GDrive + Calaméo
• [x] Merge branch for lovecraft sample book in awesome-sile-books
  • [x] Regenerate it and push to Calaméo
  • [x] Update README
• [x] Announcements