**PR Summary**

Fixes the docs Docker image build for Devtron deployment.

Changes vs `main`:
- Switches docs Docker base image from `node:18-alpine` to
`node:16-alpine` to match the original docs runtime requirement.
- Replaces `pip3 install awscli` with Alpine package install via `apk
add aws-cli`, fixing the PEP 668 externally-managed Python failure.
- Removes now-unneeded `python3`, `py3-pip`, and `openssh-client`
packages from the image.