Add all the mobile app (beta) documentation

[marcalcobe]

Creating and adding all the structure for the beta release documentation for the OpenProject Mobile App.

Ticket

https://community.openproject.org/projects/mobile-app-spike/work_packages/58347

What are you trying to accomplish?

Having a full mobile app documentation for the mobile app beta release.

Merge checklist

• [ ] Added/updated tests
• [ ] Added/updated documentation in Lookbook (patterns, previews, etc)
• [ ] Tested major browsers (Chrome, Firefox, Edge, ...)

[MayaBerd]

@marcalcobe thank you very much for putting this guide together! I've learned a lot about the mobile app while reviewing it. I will probably like to do another review round once all links are added, or more changes are merged.

A side note: if you still have to original screenshots for the troubleshooting section, could we change the color of the highlighting boxes from red to green, to keep it in the same style as the rest of the docs (except for really old ones)?

[marcalcobe]

Hi @MayaBerd, I've added all the remaining changes after your previous review. Also, we included the links to the OS Stores that for now don't work because they are not yet public, but once the app is published they will be the same urls so it will work then.

@psatyal, @oleksii-openproject (or @yanzubrytskyi) it would be great if you could also take a look into this documentation from a copywriting and technical side.