d/control: Fix packaging issues, set Team Maintainer & add Salsa CI

Arian Ottrequested to merge
Arian-Ott/tinyhtml5:debian/latest into debian/latest

Hi, this MR polishes the packaging to get it ready.

Changes:

  • d/control: Add missing 'Priority: optional'
  • d/control: Fix description synopsis (lintian warning)
  • d/control: Set Maintainer to Debian Python Team and move you to Uploaders
  • Add d/salsa-ci.yml for standard Salsa CI

References: #1125002 (ITP)

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