SolidOs should be able to let users have more Bookmark instances

[timea-solid]

This is at the moment limited here: https://github.com/solid/solid-ui/blob/23e59b8bf7463376735665cfd2376400072ece71/src/chat/bookmarks.js#L103 in code
Make sure to change the tests here: https://github.com/solid/solid-ui/blob/23e59b8bf7463376735665cfd2376400072ece71/test/unit/chat/bookmarks.test.ts#L63 accordingly.
However, we need to describe how to reconcile this on frontend, in ui too.

[jeff-zucker]

See https://gitter.im/solid/solidos?at=6241820399d94f5f0c70c091 and replies for discussion.

We should be able to have any number of instances of a type for all types, not just bookmarks.

[bourgeoa]

We should be able to have any number of instances of a type for all types, not just bookmarks.

I think it is the case except for bookmarks. I can have many Chats, or meeting or trackers

[melvincarvalho]

I have coded this functionality in my todo/tracker app, so that I can have multiple todo lists.

Is the solution simply to have multiple entries in the publicTypeIndex?