Update offline maps section for Collect v2024.2

[lognaturel]

This page is linked from Collect so it's a common entry point into docs. For this reason, I invested some time to try to make it useful to a broad range of audiences.

I also tried to describe special cases we've considered and make recommendations on how to use the functionality based on some forum conversations.

@alyblenkin and @grzesiek2010 you may want to give this a quick read to see whether I forgot anything.

[alyblenkin]

Looks good! I really like the framing at the top around why this is helpful and the overall structure.

A few thoughts that came to mind (might be beyond the scope)

• Guiding people on how to change the file name because some might be quite similar
• The note around deletion is helpful. I wonder if people will want to know how you determine the file size to see if you should free up space
• Nice to have: it might be helpful to see a gif at the top of the entire flow? Or an image with the different screens to show the steps all together.

[lognaturel]

Thanks, @alyblenkin! 1 and 2 are going to depend on how the MBTiles files are being generated, Android version, etc so I think they're out of scope. I like the idea of experimenting with a gif showing the whole flow! I'll merge this and file a separate issue.