Feat/updated image system

[JohanHjelsethStorstad]

needs a lot of review, and to be made mobile friendly

Adds much of the image system (not the part for using images in sites. The component will be updated for this later). Also adds a lot of functionality that can hopefully be used on many sites.

Features:

• Adds error boundary
• Standardises the way of working with server actions through generic ActionReturn
• Standardises how to submit forms (using server actions) through custom component
• Updates and refactors many of the related UI components for forms
• Adds two file upload components for uploading one and many files (drop zone)
• Adds standard way to fetch data in batches (paging) using contexts
• Adds component (yanked from another stale branch)

Known problems:

• When updating metadata on a Image in the collection display closes due to the way data is refetched in pagingContext
• The sites created are not mobile friendly

[JohanHjelsethStorstad]

Im now done