Update links to repo

[seddonym]

Updates the references to the repo, now it's moved to a Github organization, and tweaks the badges on the README.

[codspeed-hq]

CodSpeed Performance Report

Merging #257 will not alter performance

_{Comparing update-links-to-repo (a1ca506) with main (14a8e92)}

Summary

✅ 23 untouched
⏩ 23 skipped¹

Footnotes

1. 23 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩