[web] Remove navigation panel from LeftLayoutAside
The AppSwitcher will be in a top bar, and SettingsSwitcher has to be moved to main content, because of how we use the grid.
So For now I'm removing them from the LeftLayoutAside.
Test Plan: Run web app, check that in inbox and settinngs tabs the switchers are not present
Reviewers: przemek, michal, bartek
Reviewed By: bartek
Subscribers: ashoat, tomek, atul
Differential Revision: https://phab.comm.dev/D6344