Update timeouts layout in user preferences

[gtsiolis]

Description

Minor follow-up layout updates to the timeouts settings in user preferences:

1. Simplify section title for readability and future subsections for workspace timeouts in general, see relevant docs.
2. Remove top margin above the text input
3. Decrease font weight on the help text

Cc @iQQBot @loujaybee because #16503

BEFORE	AFTER

How to test

Go to /user/preferences and notice the different layout in the timeouts section.

Release Notes

NONE

Documentation

Build Options:

• /werft with-github-actions
  Experimental feature to run the build with GitHub Actions (and not in Werft).
• leeway-no-cache
  leeway-target=components:all
• /werft no-test
  Run Leeway with --dont-test

Publish Options

• /werft publish-to-npm
• /werft publish-to-jb-marketplace

Installer Options

• with-ee-license
• with-slow-database
• with-dedicated-emulation
• with-ws-manager-mk2
• workspace-feature-flags
  Add desired feature flags to the end of the line above, space separated

Preview Environment Options:

• /werft with-local-preview
  If enabled this will build install/preview
• /werft with-preview
• /werft with-large-vm
• /werft with-gce-vm
  If enabled this will create the environment on GCE infra
• /werft with-integration-tests=all
  Valid options are all, workspace, webapp, ide, jetbrains, vscode, ssh

[gtsiolis]

Thanks for additionally approving, @iQQBot!

This still requires an approval from @gitpod-io/engineering-webapp.

[gtsiolis]

Ready-For-Review 🏓

[iQQBot]

I also noticed that our links and text are same color...

Billing is link, maybe we can also improve

[gtsiolis]

Nice catch, @iQQBot! There's already a gp-link class which can be used here safely—added this in c060693.

BEFORE	AFTER

[gtsiolis]

Thanks for taking a look, @svenefftinge! 🌮 🌮