Personal collections fields and display

[michael-wynne-wsu]

Add summary field so that it can be included in migrations.

Personal collections don't support sub-collections. That's fine, just a noted difference between them and regular collections.

Otherwise the display can be a copy of the regular collection display.

[nick-deer]

@michael-wynne-wsu added the summary field!

[michael-wynne-wsu]

@nick-deer looks good, thanks! I'll make sure it's noted https://github.com/MukurtuCMS/Mukurtu-CMS/issues/192

[nick-deer]

Personal collection summary confirmed to be migrating!