Adds koehr.ing and 250kb.club

[nkoehring]

Website (if applicable): https://koehr.ing and https://250kb.club

This PR is:

• [x] Adding a new domain

• [ ] Updating existing domain

• [ ] Changing domain name

• [ ] Removing existing domain from list

• [ ] Website code changes (darktheme.club site)

• [ ] Other not listed

• [x] The following information is filled identical to the data file

I confirm that I have read the FAQ page, particularly the red section about inappropriate content, and I attest that this site is appropriate based on those criteria.

• [x] Check to confirm

- domain: 250kb.club
  url: https://250kb.club/
  method: mediaquery
  last_checked: 2024-03-30

- domain: koehr.ing
  url: https://koehr.ing/
  method: darkonly
  last_checked: 2024-03-30

[netlify[bot]]

✅ Deploy Preview for darktheme-club ready!

Name	Link
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😎 Deploy Preview	https://deploy-preview-153--darktheme-club.netlify.app
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[garritfra]

Thanks!