Lesson 14: broken internal link to git setup instructions

[Brett Olivier]

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This regards the link Lesson 14: https://github.com/swcarpentry/git-novice/blob/main/episodes/14-supplemental-rstudio.md

in the section titled:
### Find your Git Executable

there is a dead link Git installation instructions:

[Git installation instructions](https://swcarpentry.github.io/git-novice/setup.html)

which could now be replaced with the general: Git installation instructions

[Git installation instructions](https://swcarpentry.github.io/git-novice/#installing-git)

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[K.E. Koziar]

Thanks for catching this. Feel free to submit a PR with the correction.