Add functionality page to aai.helmholtz.de

• When linking from hifis.net, one lands at aai.helmholtz.de
• From there a eye-catching button should be visible, linking to a subpage of most relevant AAI functionalities + links:
  • user management
    • how to modify my settings on attribute transmission (see helpdesk tickets on this)
  • Vo management
  • ...

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Add-on from VC 20220216

• Add prominent link to How-to-use AAI