Fix CI badge image URL. Add documentation badge.

Author: felixfontein

README.md

@@ -5,7 +5,8 @@ SPDX-License-Identifier: GPL-3.0-or-later
 -->
 
 # Community SOPS Collection
-[![CI](https://github.com/ansible-collections/community.sops/workflows/CI/badge.svg?event=push)](https://github.com/ansible-collections/community.sops/actions)
+[![Documentation](https://img.shields.io/badge/docs-brightgreen.svg)](https://docs.ansible.com/ansible/devel/collections/community/sops/)
+[![CI](https://github.com/ansible-collections/community.sops/actions/workflows/ansible-test.yml/badge.svg?branch=main)](https://github.com/ansible-collections/community.sops/actions)
 [![Codecov](https://img.shields.io/codecov/c/github/ansible-collections/community.sops)](https://codecov.io/gh/ansible-collections/community.sops)
 [![REUSE status](https://api.reuse.software/badge/github.com/ansible-collections/community.sops)](https://api.reuse.software/info/github.com/ansible-collections/community.sops)