[web] Modify settings button to open account settings

Summary:
After user clicks the button (cog in the bottom-left corner) we navigate to account settings page.
https://linear.app/comm/issue/ENG-832/open-account-settings-after-cog-icon-is-clicked

Depends on D4120

Test Plan: Click the button and check if account settings page was opened.

Reviewers: def-au1t, atul, benschac

Reviewed By: atul

Subscribers: ashoat, Adrian, yayabosh

Differential Revision: https://phabricator.ashoat.com/D4121