Add descriptions to tags and display tag cards on hover

[pickleahead]

Closes #1444
Closes #2575

• Tags get a description field
• Tag cards are shown when hovering tag badges and tag select options
• Adds an option to the interface basic settings section to enable this feature

[WithoutPants]

#2676 is going to be the next large PR to be merged and this will need to be rebased after that PR is merged.

[WithoutPants]

@pickleahead you are eligible for the bounties for #2575 and #1444. Please submit an expense to the OpenCollective for $86.02 ($100 - OpenCC fees) and mention the invoice number here, or otherwise indicate what you want done with the bounty.

[pickleahead]

@WithoutPants Would it be possible to place the bounty on another issue?

[WithoutPants]

@WithoutPants Would it be possible to place the bounty on another issue?

Yes, absolutely. Mention me in the applicable issue, and I'll sort it out.