chore: Add polar to linked funding sites

[pktiuk]

You never announced, that you started using Polar as a funding platform. I think it is good to at least link it here.

Atuin project: https://polar.sh/atuinsh/

Checks

• I am happy for maintainers to push small adjustments to this PR, to speed up the review cycle
• I have checked that there are no existing pull requests for the same thing

[pktiuk]

You could also add their bot to your repo to allow making donations linked with specific issues. :)

[pktiuk]

@ellie
Do you actively use polar?

[ellie]

You could also add their bot to your repo to allow making donations linked with specific issues. :)

This is actually something I'd like to actively avoid - issues should be resolved because they're the best thing for the project, regardless of financial incentives

Do you actively use polar?

Not presently I'm afraid

[pktiuk]

Understandable