docs: update models README references

[ginglis13]

Issue number:

n/a

Description of changes:

update references in the models readme to their new locations.

cargo readme > README.md

Testing done:

n/a

Terms of contribution:

By submitting this pull request, I agree that this contribution is dual-licensed under the terms of both the Apache License, version 2.0, and the MIT license.

[ginglis13]

Cancelling CI since this is just a documentation change.

[bcressey]

LGTM.

We need to move schnauzer out of this repo (somehow) so we can clean up the dependencies like this that ought to be maintained only in the core kit or the settings SDK.