hub : feat: appcard improvements & linking account (#235)

* feat: app card improvements

* fix: copy sidebar

* feat: frontend implementation (wip)

* fix: configurable budget & renewal

* fix: review feedback

* fix: scopes for alby account app connection

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Co-authored-by: Roland Bewick

https://github.com/getAlby/hub/commit/060087bd6054b4c19683e32b9994f5f458888943