Issue title: IA 1: Expectations
 Issue body: ### Objective

We appreciate that users are trying Element with pre-existing expectations of how to use the interface to achieve their goals.  This may come from [HIG](https://developer.apple.com/design/human-interface-guidelines/ios/overview/themes/), it may come from other products they've previously used to achieve their goals, or other products they use for other goals.

The more we understand their pre-existing expectations, and respect them, the quicker we can help users discover what they want and find value in Element.

**Tasks**

- [ ] Artefacts: Competitor IA maps
   - [ ]  Professional use (co-worker and teams)
     - [ ] Slack
     - [ ] Teams 


 Comments: 
 Comment 0: I'm going to close this planning issue as we're almost at release stage on the app layout
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