Restore some of the bottom margin on dashboard pages

[gtsiolis]

Problem to solve

In #4417 (cc @corneliusludmann), we've removed the bottom margin on dashboard pages, however, we need to always keep some of the bottom margin (e.g. mb-16) to allow long lists Workspaces or sections like Prefereces render without touching the bottom of the viewport on small viewports.

[corneliusludmann]

Makes sense.

Suggestion: Please document the reason for the bottom margin in the code so that we remember it for future changes.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[gtsiolis]

This is still relevant. Adding meta: never-stale label.

[jwpjrdev]

I might do this sometime. It's been driving me crazy for months.

[trumbitta]

Following the line of though of this comment from #4417 ("we should find a proper solution")

And having seen what happens at small resolutions / viewports:

I think reworking the whole dashboard app with a modern mobile first approach might be resolutive in regards of this and other issues that may and will arise.
The layout will be more robust, resilient, possibly more maintainable and easily extendable because mobile first has the main effect of giving you something that's good on mobile and tablets, and the side effect of giving you something that's good everywhere 😄 . It's not dissimilar from Accessibility in this: both of them make the experience better for everyone.

And hey 🖐️ I can help. I have experience in mobile first, have been advocating for it, building my web apps like this since 2011 when I read the seminal book about it, and I can work on it together with a Designer (if Gitpod has a Product Designer, this is of course the preferred way!), in a team, or alone.
I've been doing it at my daily jobs for the last 10yrs and it's just how I think about web apps.

It's not something we can do overnight in a magic little size/S PR, but step by step we can manage to pull it off.

Come find me on discord if you like the idea!