Make npmrc-ci reusable in other projects

Simon Mangelrequested to merge
smangel/factlibjs:simon.mangel.sm-master-patch-73025 into master

To be able to reuse npmrc-ci in other projects, I suppose it is advisable to use ${CI_PROJECT_ID} instead of the specific project id of factlib.js.

This is best practice, as it is done this way in the documentation.

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