Update Skeleton Instructions for Development Guide Project Setup

[dv4harr10]

🗣 Description

This PR will update the Documentation Guide Project Setup markdown files instructions to create new skeleton repositories or skeletonize existing repositories.

💭 Motivation and context

These updates are required for uniformity of the cisagov skeleton updates to create and update repositories and to advise on the latest skeletonize tools used.

✅ Pre-approval checklist

• [x] This PR has an informative and human-readable title.
• [x] Changes are limited to a single goal - eschew scope creep!
• [x] All relevant type-of-change labels have been added.
• [x] I have read the CONTRIBUTING document.
• [x] These code changes follow cisagov code standards.
• [x] All relevant repo and/or project documentation has been updated to reflect the changes in this PR.
• [x] All new and existing tests pass.

✅ Pre-merge checklist

• [ ] Revert dependencies to default branches.
• [ ] Finalize version.

✅ Post-merge checklist

• [ ] Create a release.

[jsf9k]

Let's get @mcdonnnj's review before merging.