v1.1.0 Ansible Galaxy Release

This release improves the documentation, particularly the installation instructions. It now mentions the new option to download from Ansible Galaxy first.

Added

• Released role on Ansible Galaxy as lingling9000.btrfssubvol.
• Installation instructions using Ansible Galaxy as source.
• Changelog on basis of https://keepachangelog.com/en/1.1.0/.
• Code of conduct on basis of Contributor Covenant v2.1.

Changed

• To reflect the Ansible Galaxy namespace lingling9000 on Codeberg, an
  organization has been created and the repository moved. It is now located at
  https://codeberg.org/lingling9000/ansible-role-btrfssubvol. The corresponding
  links in the documentation have been updated.
• Examples reflect the role name from Ansible Galaxy.
• Minor wording and formatting improvements in documentation.