User guide / handbook

**Is your feature request related to a problem? Please describe.**
Yes. The issue is with Voyager's UI I'm unable to find how to actually post to any community. I've spent several minutes looking through all options (after logging in) and couldn't find any button or option that allows me to post something.

**Describe the solution you'd like**
I'd like a general user guide for the app. That explains the current functions as well as showing how / where to use them.

**Describe alternatives you've considered**
A redesign of the UI, which isn't in the scope of the project though as it is made to be visually similar to the Apollo app.

**Additional context**
No visible post button / context hint: