Reconcile wiki and mkdocs

### Overview

We need to make it clear what goes into the wiki vs. mkdocs. And there needs to be some links to go both ways.

### Action Items

- [ ] identify places and link to mkdocs from the wiki
- [ ] identify places and link to the wiki from mkdocs
- [ ] create wording for what should go into the wiki vs. mkdocs and put it in sensible places in each document

### Resources/Instructions

#### wiki links to [mkdocs](https://hackforla.github.io/peopledepot/)

- main page?

#### mkdocs links to [the wiki](https://github.com/hackforla/peopledepot/wiki)

- README.md
- contributing?

#### what goes in the wiki vs. mkdocs

We use the [project wiki](https://github.com/hackforla/peopledepot/wiki) to hold information relating to project management and the [MkDocs site](https://hackforla.github.io/peopledepot/) for information about the project code.

The MkDocs site is meant to be updated along with code changes. The documentation should reflect what the latest code does.