Feature/update git

[grallewellyn]

• now tell users to use personal access token instead of password
• I removed the section https://docs.maap-project.org/en/latest/getting_started/writing_code.html#The-MAAP-GitLab-Code-repository because it was basically the same as the section above. I just added a note to the section above about cloning through MAAP GitLab
• work_with_git is now a one stop shop for all git information
• Used this google doc as a guide for rewriting section

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[wildintellect]

This might be a better place to mention gitignoring checkpoints? https://github.com/MAAP-Project/maap-documentation/pull/350#issuecomment-1793150859

[grallewellyn]

This might be a better place to mention gitignoring checkpoints? #350 (comment)

I agree, just pushed changes