Update collaborative-blog-with-jekyll-github.md

[anisa-hawes]

I'm opening this Issue to replace a broken link in the EN lesson collaborative-blog-with-jekyll-github.

• The problem link is:
  • https://www.ubiquitypress.com/site/books/10.5334/bbc/
• I've replaced this with:
  • https://www.ubiquitypress.com/chapters/e/10.5334/bbc.a

Closes #3641

Checklist

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• Add the appropriate "Label"
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[jenniferisasi]

All good!

[anisa-hawes]

Thank you, @jenniferisasi 👐🏼

--

Hello Alex @hawc2,
Just to keep you updated on a quick link fix in collaborative-blog-with-jekyll-github.