Move Docker image into main repository

We have decided to move the Docker image from the [janusgraph-docker](https://github.com/JanusGraph/janusgraph-docker) into this repo here to simplify the development workflow and to improve the usability of the security scanning.

This includes the following tasks:

- [x] Move the image itself in the repository: #3782.
- [x] Set the required tags: `latest` / `1.0` / `0.6`. #3842
- [ ] Integrate the documentation more nicely in the docs. The README.md from `janusgraph-docker` was its own independent documentation.
- [x] Add ghcr.io registry as alternative https://github.com/JanusGraph/janusgraph/pull/3796
- [x] Mark janusgraph-docker as archived https://github.com/JanusGraph/janusgraph-docker/pull/135
- [x] add docker hub logins to secrets
- [x] https://github.com/JanusGraph/janusgraph/issues/3905

The remaining unchecked task is to integrate the README.md from the janusgraph-docker repository into this repository's documentation. Start by comparing that README with the existing JanusGraph docs and determine where its content belongs. Done means the Docker image documentation is integrated rather than maintained as independent documentation.

Written by the indexing model from the issue text.