[F] DIS-352 List collections

[leojpod]

This PR implements DIS-352

Work done:

• [X] copy the inline-edit component from CMP
• [X] create a service like favourites but to deal with `collections
• [X] simplify the logic of both favourites and collections to treat the current user data as any other user data (except with a computed property as shortcut)

To test it: In the absence of ways to create a collection from the front-end and in the absence of mirage to fake it ... there is no other way around than creating the bookmarks via postman or equivalent:

• create a new POST request addressed to localhost:4200/new-bookmarks/create-collection
• copy your user's JWT from the localstorage and paste it a new header: Authorization / Bearer {put your JWT here}
• write up a body that looks like that:

  {
  "name": "this is a collection",
  "owner_id": "{put here the id of your user}"
  }

• send the request, check that it worked and then refresh the /collections page on the FE to see your new collection appear there.

[leojpod]

comment addressed and description updated.