[Enhancement] Multiple tags per page

[andrewzhurov]

Hi. Loving the extension thus for, thanks for your effort!

I have a point point. Some tabs may relate to multiple tags.
E.g., the paper "Keep CALM and CRDT on" relates to both "CALM" (theorem) and "CRDT" tag.

I guess it would be nice to be able to mark tabs with multiple tags.
And have them listed under the corresponding tag bins accordingly.
(so "Keep CALM and CRDT on" would exist under both "CALM" and "CRDT" tag)

I guess this colud be achieved now by duplicating the tab, but feels a bit tedious.

UX of "add a tag to a page" could be refined and look like input, perhaps with suggests based on existing tags.

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As a feature on top, there can be a search for tags.
Where by entering "CALM" and "CRDT" one would get pages that have both tags on them.