Update the iOS documentation to be more complete and recent

[bitterepic]

Updates the recommended arch to aarch64-apple-ios from x86_64-apple-ios for computers with Apple Silicon. Also added the extra steps people might get stuck on configuring xcode.

NOTE:

For x86_64-apple-ios, it sounds like Rosetta is sometimes not installed which can cause the app to crash. I didn't add documentation on that.

[ryanmcgrath]

Does that target need Rosetta? I'd be surprised since Rosetta is ultimately due to get yanked anyway... but don't know offhand.

[bitterepic]

I think running the code in the simulator might have needed rosetta, but I don't really have the context or experience. It was supposed to be automatically installed when needed but wasn't for some people (from what I see in internet searches.) Since I don't know for sure, I'm just avoiding documenting anything about Rosetta for now.

[bitterepic]

Note to self: Look into adding documentation on signing the bundle

[madsmtm]

x86_64-apple-ios should really be called x86_64-apple-ios-sim - it's a simulator target. So it needs Rosetta if you're testing it on a Mac with Apple Silicon.

(Which you shouldn't generally need to do, if you ever need it it's because you have an Intel Mac, or you're using it in GitHub's x86 Intel runners).

[simlay]

Note to self: Look into adding documentation on signing the bundle

Here's an example on signing via a Makefile and codesign - I read those lines now and wish the rule dependency were more in order. I've not touched this in a while so it might not work anymore.