Docs update request: /docs/install/install-with-docker

[dewindtk]

Please update your install with Docker section to include a demo Dockerfile for advanced users.
I greately appreciate it.

[dennis-tra]

+1 from me. The section https://docs.prylabs.network/docs/install/install-with-bazel#advanced-build-docker-images-from-source is outdated. There's no image_bundle bazel target anymore.