remove embeddings

[Chickensoupwithrice]

We don't ship embeddings anymore, so I've removed the embeddings yaml files from the repo.
Currently unsure if sg ops update-images needs to be updated as well, or if it reads from this directory 🙏

Checklist

• Sister deploy-sourcegraph change:
• Sister customer-replica change (if necessary, for any changes affecting pure-docker or configuration):
• All images have a valid tag and SHA256 sum

Test plan

The release happens