HIFIS Documentation restructuring, Portal Resource Request documentation

[SW]:

• Restructures the Cloud section
  • user/provider-centric perspective
  • Moves information relevant to HIFIS team only
• Adds a first version of Cloud Portal's resource request documentation

the MR supersedes !503 (closed)

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[UJ]:

In this context, some major restructuring has been made, in accordance with our discussions on documentation revamp in May.

• Integrates documentation Helmholtz Cloud with Backbone (core), and Software Technology Services, as the originating work packages/clusters are of no interest for users
• No major content has been removed, or links changed (at least they shouldn't), it's merely about the menu structure

Review:

• @frust45m, @andreas.klotz, @marcus.albrecht, @laura.marie.holz, @SpickerHZB please possibly check until 2024-08-29 if this goes roughly in an acceptable direction
• please provide brief feedback if this can go online with this MR. As usual, further adaptions can and will be made later on