Add pyaerocom logo to README.rst and readthedocs

[lewisblake]

Change Summary

Title + update aerotools workflow logo

Related issue number

Close https://github.com/metno/AeroToolsIssues/issues/67

Checklist

• Start with a draft-PR
• The PR title is a good summary of the changes
• PR is set to AeroTools and a tentative milestone
• Documentation reflects the changes where applicable
• Tests for the changes exist where applicable
• Tests pass locally
• Tests pass on CI
• At least 1 reviewer is selected
• Make PR ready to review

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.46%. Comparing base (9591a7d) to head (630a314).
Report is 14 commits behind head on main-dev.

Additional details and impacted files

@@            Coverage Diff            @@
##           main-dev    #1491   +/-   ##
=========================================
  Coverage     78.46%   78.46%           
=========================================
  Files           139      139           
  Lines         21119    21119           
=========================================
  Hits          16570    16570           
  Misses         4549     4549           

Flag	Coverage Δ
unittests	78.46% <ø> (ø)

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[thorbjoernl]

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