docs: Added installation guide for macOS with M2 chips to FAQ.

[mikediessner]

I have added a section to the FAQs that describe how pystan can be installed when using macOS and a M2 chip. The usual way of installing pystan and all it dependencies did not work for me.

[riddell-stan]

Thanks for this. We need an entry like this. Two suggestions:

• Make sure it's valid reStructedText (RST). The syntax for bullet points is more strict than markdown. See https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html
• Rephrase it so it applies to Apple Silicon generally -- not just M2?

[mikediessner]

Good catch. I've made the suggested changes.

[riddell-stan]

Almost there. There's still an RST problem. This is what I see (rendered HTML):

How can I run pystan on macOS with Apple silicon chips (Apple M1, M2, etc)? -------------------------------------------------------

Again, RST is much less forgiving than markdown. (Now that Sphinx has better support for Markdown, we probably should switch.)

Please fix this and check that it renders correctly. Also, squash your commits into a single commit.

[mikediessner]

Right, I've found and fixed the issues and it renders correctly. Squashed everything into one commit. Cheers!