Fix GitHub Actions badge svg, remove appveyor placeholder
Shapely
=======
-|github-actions| |appveyor| |coveralls|
+|github-actions| |coveralls|
-.. |github-actions| image:: https://github.com/shapely/shapely/workflows/Tests%20(Linux)/badge.svg?branch=main
+.. |github-actions| image:: https://github.com/shapely/shapely/workflows/Tests/badge.svg?branch=main
:target: https://github.com/shapely/shapely/actions?query=branch%3Amain
.. |coveralls| image:: https://coveralls.io/repos/github/shapely/shapely/badge.svg?branch=main
