Extension: Frontend modifications

[overflw]

• Move Extension-install popup over card-grid!
• Poll for extension availability
• Update browseraction window
• Should not be displayed at all?
• No pre-installed wfs
• Change Name
• Change Logo!
• Change welcome page
• Should not be displayed.
• Action menu
• Link to Frontend (Home)
• Record (how-to)
• Link to Automa "Backend" / "Settings" / "Read more"