docs: fix link to blog post

[blimmer]

Description

The current link 404s.

Performance impact

N/A - docs only

Security impact

N/A - docs only

Checklist

• [x] My code matches the project's code style and yarn lint:fix passes.
• [x] I've added tests for the new feature, and yarn test passes.
• [x] I have detailed the new feature in the relevant documentation.
• [x] I have added this feature to 'Pending' in the RELEASE_NOTES.md file (if one exists).
• [x] If this is a breaking change I've explained why.