Retire https://apache.github.io sites and remove obsolete content/actions

Currently there are three versions of the Hive website (populated from different places and in various ways) available online. Below, I outline the entry point URLs along with the latest commit that lead to the deployment each version.

People searching online for Hive may end-up in any of the above risking to see pretty outdated information about the project.

For Hive developers (especially newcomers) it is very difficult to figure out where they should apply their changes if they want to change something in the website. Even people experienced with the various offering of ASF and GitHub may have a hard time figuring things out.

I propose to retire/shutdown all GitHub pages deployments (https://apache.github.io) and drop all content/branches that are not relevant for the main website under https://hive.apache.org/.