docs: link Untether blog posts in README footer

[Nathan Schram (nathanschram)]

Summary

• Add "From the blog" section between Acknowledgements and Licence
• Links two littlebearapps.com posts directly relevant to Untether:
  • Coding from the park — why Untether exists
  • Dogfooding bugs tests can't find — integration testing rationale
• Uses <a target="_blank" rel="noopener noreferrer"> so links open in a new tab on GitHub (PyPI's readme_renderer may strip target — acceptable)

Minor SEO/referral win for littlebearapps.com — README is mirrored on PyPI (dofollow there), drives referral traffic, and increases AI-citation surface.

Test plan

• Confirm both URLs return 200 (verified at commit time)
• Confirm rendered README on GitHub opens links in a new tab
• Confirm PyPI package page still renders the section (target may be stripped, links should still resolve)

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