Hide the archived section

[dbkr]

This just hides the 'Archived' room list section, on the justification that it's somehow weird and a little buggy, and it's better for rooms to just go away once you leave them than hang around and be buggy, although of course it does mean you no longer have access to the history of those rooms.

This just leaves the Archives section in the code, but doesn't display it. A fix was needed in Algorithm because removing it from the order list meant that sometimes we ended up with no such section and Algorithm expects it to exist, so this was the simplest fix. I looked at stripping out the entire existence of the section, but the first problem was that it means that left rooms are just still displayed in the room list, so we'd need to find a way to not show them. Room visibility doesn't work for this because it doesn't expect visibility of a room to change.

Assuming this seems okay, I'll create a bug to remove the archived section entirely. We could also look at removing just the code for forgetting rooms.

Checklist

• Tests written for new code (and old code if feasible)
• Linter and other CI checks pass
• Sign-off given on the changes (see CONTRIBUTING.md)

[morguldir]

Then there wouldn’t be a way to forget rooms either right? At least for me this would result in a really large list of forgotten rooms, if i for example were to use a client with historical rooms, or if the Archive was reintroduced later