Add peterkeenan.net to sites.yml

[galambborong]

This PR is:

• [x] Adding a new domain
• [ ] Updating existing domain size
• [ ] Changing domain name
• [ ] Removing existing domain from list
• [ ] Website code changes (512kb.club site)
• [ ] Other not listed

• [x] I used the uncompressed size of the site
• [x] I have included a link to the Cloudflare report
• [x] This site is not an ultra minimal site
• [x] The following information is filled identical to the data file

I confirm that I have read the FAQ section, particularly the two red items around minimal pages and inappropriate content and I attest that this site is neither of these things.

• [x] Check to confirm

- domain: peterkeenan.net
  url: https://peterkeenan.net/
  size: 68.71
  last_checked: 2024-08-25

Cloudflare Report: https://radar.cloudflare.com/scan/6af90b7e-756b-41d1-b094-e8ab25f6d8ca/summary

[garritfra]

Thanks!