Applications: Design review tasks

[juliushaertl]

@enjeck I created this as a follow up task to collect the feedback during the design review call so we can track implementing that

[enjeck]

• [x] collapse navigation by default when navigating to application
• [ ] https://github.com/nextcloud/tables/issues/933
• [ ] Skip modal and do editing directly in the page once I click new application without going through a form dialog (future)
• [x] Randomize icons like for table creation
• [x] more whitespace below tables list

[juliushaertl]

Important ones are done, others are tracked in separate follow up tickets.