Switch to ci-buildwheel, removing httpstan-wheels

[riddell-stan]

See stan-dev/httpstan-wheels#51 for a description and likely solution.

Eliminating the httpstan-wheels repository would be wonderful. Why it needs to exist at all is confusing.

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[riddell-stan]

What https://github.com/scikit-hep/boost-histogram has done is impressive. It would be wonderful if we could copy it.

Here's their table of wheels (+ source dist!):

System	Arch	Python versions	PyPy versions
ManyLinux1 (custom GCC 9.2)	32 & 64-bit	3.6, 3.7, 3.8
ManyLinux2010	32 & 64-bit	3.6, 3.7, 3.8, 3.9	(64-bit) 7.3: 3.7
ManyLinux2014	32 & 64-bit	3.10
ManyLinux2014	ARM64	3.6, 3.7, 3.8, 3.9, 3.10
MuslLinux_1_1	64-bit	3.6, 3.7, 3.8, 3.9, 3.10
macOS 10.9+	64-bit	3.6, 3.7, 3.8, 3.9, 3.10	7.3: 3.7
macOS Universal2	Arm64	3.8, 3.9, 3.10
Windows	32 & 64-bit	3.6, 3.7, 3.8, 3.9, 3.10	(64-bit) 7.3: 3.7

Note musllinux, Linux arm64, and macOS Universal2.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.