Issue #64: Add vignette explaining models

[parksw3]

Description

This PR closes #64.

Adds a model write up vignette for the naive and latent models.

Checklist

• My PR is based on a package issue and I have explicitly linked it.
• I have included the target issue or issues in the PR title in the for Issue(s) issue-numbers: PR title
• I have read the contribution guidelines.
• I have tested my changes locally.
• I have added or updated unit tests where necessary.
• I have updated the documentation if required.
• My code follows the established coding standards.
• I have added a news item linked to this PR.
• I have reviewed CI checks for this PR and addressed them as far as I am able.

[seabbs]

This is really nice @parksw3 and personally I am pretty happy with it as is if you are? The only thing missing from this for me is to update the news file and the pkgdown yaml (so that this is listed on the package website). In a follow issue I guess we need to link to this new vignette from elsewhere in the package?

[parksw3]

I think there's just a bit more I want to edit/add. I'll do that towards the end of this week alongside updating the news file and the pkgdown yaml.

[parksw3]

Sorry, it took me longer than I expected to get to this. I tweaked the text very tiny bit and added the new file to package yaml. Am happy with it as is.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.38%. Comparing base (3a40384) to head (7aa2b75).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #514   +/-   ##
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  Coverage   94.38%   94.38%           
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  Files          17       17           
  Lines         837      837           
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  Hits          790      790           
  Misses         47       47           

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[seabbs]

Nice looks good to me. I fixed the linting issues, added some fluff text, checked some grammar, and removed the commented out code.