chore(repo): prepare first release

[renefloor]

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• I have signed the Stream CLA (required).
• The code changes follow best practices
• Code changes are tested (add some information if not applicable)

Description of the pull request

This updates pubspec, changelog and fixes bit of the docs before release.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.05%. Comparing base (280b104) to head (ebc57e7).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #11   +/-   ##
=======================================
  Coverage   87.05%   87.05%           
=======================================
  Files           4        4           
  Lines         170      170           
=======================================
  Hits          148      148           
  Misses         22       22           

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