Updated URLs to the Project Management Protocol in the best practices section

[bakhshir]

Changes in this PR

Updated URLs to the Project Management Protocol in the best practices section. Fulfilling my promise on making best practices section as accessible as possible.

Checklist

update

• I checked whether the contribution fits in The Turing Way before considering contributing to this Guide.
• I just delivered on my old promise to publish the protocol in order to update these links in the guide ;-)

ALL contributions

• I previewed my changes locally using e.g. python3 -m http.server 4000 and confirmed they work correctly.
• I checked for broken links, e.g. using the link checker GitHub Action workflow at least for the files I changed.
• My name was added to the CITATION.cff file.

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[bouweandela]

Thanks @bakhshir! Enjoying the new job? ;-)