Map out idealized repo structure for `freemocap-core` and for the sub-skellies

[jonmatthis]

• [ ] Come up with a schema and guidlines specifying repo structure and CI/CD strategies for:
  • core freemocap software
  • sub-skelly repos
• [ ] Write up relevant section (with table/fig?) in #7

Some brief outline info available here: https://github.com/freemocap/2024-nsf-pose/blob/main/notes/document-notes/2024-freemocap-nsf-pose-outline.md#freemocap-softwares

[jonmatthis]

@philipqueen will get started drafting the basic plan