Ability to filter search by user bookmark/list

[daft-develop]

I think a nice enhancement might be to add a search filter for a user's bookmark/list. One use case I imagined is bookmarking any adventures I own and then using that filter with the search tool to limit results to what I already have on hand. If nothing matches then I can expand my search to new adventures.

I think that also helps as a motivation for users to add more adventures to the tracker, since it can double as a tool to search your own library.

[daft-develop]

I notice this was a side-suggestion in #141, but I felt it could be a stand-alone issue to consider