Update README.md

[nialloulton]

The link to A Comprehensive Guide to Bayesian Marketing Mix Modeling was broken, updated and fixed it.

Description

Updated broken link for the blog post by 1749

Related Issue

• Closes #
• Related to #
• Unrelated

Checklist

• Checked that the pre-commit linting/style checks pass
• Included tests that prove the fix is effective or that the new feature works
• Added necessary documentation (docstrings and/or example notebooks)
• If you are a pro: each commit corresponds to a relevant logical change

Modules affected

• MMM
• CLV

Type of change

• New feature / enhancement
• Bug fix
• Documentation
• Maintenance
• Other (please specify):

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📚 Documentation preview 📚: https://pymc-marketing--660.org.readthedocs.build/en/660/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.78%. Comparing base (f0097e2) to head (a0f8291).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #660   +/-   ##
=======================================
  Coverage   91.78%   91.78%           
=======================================
  Files          24       24           
  Lines        2386     2386           
=======================================
  Hits         2190     2190           
  Misses        196      196           

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