Apps catalog: add overview section to list all apps

[sanderhartveld]

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Is your feature request related to a problem? Please describe.
When new to Nextcloud Administration it is a hassle to find apps so an overview of all apps with a search would be very useful. Google has helped to find the right apps for what we want, but then it's a hassle to find that app to install it going trough all the categories.

Describe the solution you'd like

• make search within apps global across all app categories
• add overview category with all apps

Describe alternatives you've considered
(None)

Additional context
(None)

[susnux]

make search within apps global across all app categories

done with #57290