Remove secondary navigation on the admin dashboard

[gtsiolis]

Problem to solve

When an admin user visits the admin dashboard, the secondary navigation is visible while none of the options is selected since we're currently using a page layout with the left sidebar for selecting Users and Workspaces sub-pages.

Proposal

While we could eventually re-use that secondary navigation as we work towards improving the admin dashboard (#7597), a good MVC (minimum viable change) could be to remove secondary navigation on the admin dashboard.

BEFORE	AFTER

[SangameshItagi]

Hi @gtsiolis
I am interested working on this issue. Can you assign it to me?

[gtsiolis]

Hey @SangameshItagi! Yes, feel free to open a pull request (PR) for any open issue without an assignee. 🏓

[gtsiolis]

@SangameshItagi While removing the extra tabs is a great MVC (minimum viable change) and you are more than welcome to open a PR about this, just wanted to give a heads-up about what's changed and the long-term direction of the navigation inside the admin dashboard.

Given the recent additions of the settings (#7732) and upcoming addition of projects (#7636) in the admin dashboard, now that we have tabs, which were not preset during the initial dashboard redesign, long-term we'd like to use the tabs and replace the pills we currently have in the admin dashboard as this pattern fits and scales better for this need. I've opened #7879 to track this in case you'd like to pick that issue up instead of this one. Your call. 🏀

[SangameshItagi]

@gtsiolis Sure will pick #7879 issue, instead of this.

[gtsiolis]

Closing this in favor of #8385.