Clean up old readthedocs sites

[SgtCoDFish]

There are other sites which mention cert-manager (e.g https://cert-manager-munnerz.readthedocs.io). These can appear in searches and might be confusing. We should take a look at ensuring that everything links to cert-manager.io

/kind cleanup

[maelvls]

Note: searching for issuerRef leads to this link:

https://docs.cert-manager.io/en/release-0.7/tasks/issuing-certificates/index.html

Is it also a readthedocs page?

[SgtCoDFish]

docs.cert-manager.io

Some versions have redirects in place and others don't, hence why release-0.7 pops up in search results.

Ideally, there'd be support for adding redirects in the cert-manager readthedocs.io project. Otherwise, we could have to go back to really old release branches and update them manually.

cert-manager-munnerz.readthedocs.io

This is the last commit before the docs/ folder was cleaned out in the cert-manager repo - so this is what cert-manager-munnerz is built from AFAIK.

Fixes

The best fix would be if there are settings in the cert-manager and cert-manager-munnerz readthedocs.io projects for redirecting all pages to https://cert-manager.io. Failing that, it seems possible to set versions to "hidden" in the control panel.

In addition, we could add a robots.txt to the docs/ folder to prevent search engines indexing the old docs sites - this would work for both docs.cert-manager.io and cert-manager-munnerz.readthedocs.io. There are docs surrounding this.

[SgtCoDFish]

I don't think I can do much more investigation without access to the readthedocs.io project, and the only person listed as a maintainer is @munnerz

James, do you still have access to these projects?

[SgtCoDFish]

There's also a readthedocs webhook on https://github.com/jetstack/cert-manager which should be removed.

[SgtCoDFish]

@munnerz has deleted both projects (:heart:), so in time they'll presumably be removed from search engines.

(see on slack)

I think this can be considered closed now!