Refactor repository composition

[chrisdoherty4]

The hub repository is in dire need of help. This PR tidies the repository up in preparation to introduce a CI that pushes images to quay.io.

Changes include:

• Simplify action Makefiles for use in local builds.
• Simplify directory structure including removal of v1 path parts.
• Introduce root Makefile build cmd for all images.
• Update GCC to latest minor versions.
• Adjust listed maintainers and repo permissions.
• Delete Go cmd to build images.
• Update builds to use Go 1.21.
• Remove Artifact hub related builds and pushes; we don't maintain it and will switch to quay.io.
• Remove workflows because they pertain to Artifact Hub or Quay which doesn't have any repositories for Hub.

This does not change any Go sources.

The new file structure has all actions located in the root directory. In conjunction with a rename of the repository to action it'll make for intuitive navigation.

[chrisdoherty4]

@jacobweinstock Admittedly I blindly removed the metadata, thanks for taking the time. Will update shortly.

[chrisdoherty4]

@jacobweinstock The README descriptions should be added back.