Remove AppVeyor testing (libgeos#737)

As discussed in https://lists.osgeo.org/pipermail/geos-devel/2022-November/010810.html

README.md

@@ -17,8 +17,8 @@ The official Git repository is at [GitHub](https://github.com/libgeos/geos).
 | CI    | Status | CI    | Status | CI    | Status |
 | :---: | :----- | :---: | :----- | :---: | :----- |
 | GitHub | [![github](https://github.com/libgeos/geos/workflows/CI/badge.svg?branch/main)](https://github.com/libgeos/geos/actions?query=workflow:CI+branch:main) | Bessie | [![bessie](https://debbie.postgis.net/buildStatus/icon?job=GEOS_Worker_Run/label=bessie&build=last:${params.reference=refs/heads/main})](https://debbie.postgis.net/view/GEOS/job/GEOS_Worker_Run/label=bessie) | Debbie | [![debbie](https://debbie.postgis.net/buildStatus/icon?job=GEOS_Master)](https://debbie.postgis.net/view/GEOS/job/GEOS_Master/) |
-| AppVeyor | [![appveyor](https://ci.appveyor.com/api/projects/status/62aplwst722b89au/branch/main?svg=true)](https://ci.appveyor.com/project/dbaston/geos/branch/main) | Bessie32  | [![bessie32](https://debbie.postgis.net/buildStatus/icon?job=GEOS_Worker_Run/label=bessie32&build=last:${params.reference=refs/heads/main})](https://debbie.postgis.net/view/GEOS/job/GEOS_Worker_Run/label=bessie32) | Winnie | [![winnie](https://winnie.postgis.net/view/GEOS/job/GEOS_Master/badge/icon)](https://winnie.postgis.net/view/GEOS/job/GEOS_Master/) |
-| GitLab CI | [![gitlab-ci](https://gitlab.com/geos/libgeos/badges/main/pipeline.svg)](https://gitlab.com/geos/libgeos/commits/main) | Berrie | [![berrie](https://debbie.postgis.net/buildStatus/icon?job=GEOS_Worker_Run/label=berrie&build=last:${params.reference=refs/heads/main})](https://debbie.postgis.net/view/GEOS/job/GEOS_Worker_Run/label=berrie) | Dronie | [![dronie](https://dronie.osgeo.org/api/badges/geos/geos/status.svg?branch=main)](https://dronie.osgeo.org/geos/geos?branch=master) |
+| GitLab CI | [![gitlab-ci](https://gitlab.com/geos/libgeos/badges/main/pipeline.svg)](https://gitlab.com/geos/libgeos/commits/main) | Bessie32  | [![bessie32](https://debbie.postgis.net/buildStatus/icon?job=GEOS_Worker_Run/label=bessie32&build=last:${params.reference=refs/heads/main})](https://debbie.postgis.net/view/GEOS/job/GEOS_Worker_Run/label=bessie32) | Winnie | [![winnie](https://winnie.postgis.net/view/GEOS/job/GEOS_Master/badge/icon)](https://winnie.postgis.net/view/GEOS/job/GEOS_Master/) |
+| | | Berrie | [![berrie](https://debbie.postgis.net/buildStatus/icon?job=GEOS_Worker_Run/label=berrie&build=last:${params.reference=refs/heads/main})](https://debbie.postgis.net/view/GEOS/job/GEOS_Worker_Run/label=berrie) | Dronie | [![dronie](https://dronie.osgeo.org/api/badges/geos/geos/status.svg?branch=main)](https://dronie.osgeo.org/geos/geos?branch=master) |
 | | | Berrie64 | [![berrie64](https://debbie.postgis.net/buildStatus/icon?job=GEOS_Worker_Run/label=berrie64&build=last:${params.reference=refs/heads/main})](https://debbie.postgis.net/view/GEOS/job/GEOS_Worker_Run/label=berrie64) |
 
 ## Community Resources