`getsops.io/docs` contains outdated info on ssh keys

[minhtrancccp]

ssh keys has been supported with pr #1692, but getsops.io/docs still claims the opposite

[felixfontein]

The current documentation is the README in this repository, not on getsops.io.

[felixfontein]

getsops.io/docs/ is currently (since yesterday) showing the docs for 3.11.0. I have a PR (getsops/docs#17) ready to update it to 3.12.0 once that's released.

[felixfontein]

We finally made the switch so that https://getsops.io is the current source of documentation for the released SOPS version. (https://main.getsops.io is documentation for the current main branch.) The README now redirects users to getsops.io.