fix: integrated docs (#431)

## Description
In order for go modules to pull our docs directories into the `uds` repo
and use the tagged release version of uds-core the go.mod file needs to
be at the base level of the repo.



## Type of change

- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Other (security config, docs update, etc)

## Checklist before merging

- [x] Test, docs, adr added or updated as needed
- [x] [Contributor Guide
Steps](https://github.com/defenseunicorns/uds-template-capability/blob/main/CONTRIBUTING.md)(https://github.com/defenseunicorns/uds-template-capability/blob/main/CONTRIBUTING.md#submitting-a-pull-request)
followed

Co-authored-by: Micah Nagel <micah.nagel@defenseunicorns.com>

go.mod

@@ -0,0 +1,3 @@
+module github.com/defenseunicorns/uds-core
+
+go 1.20