Add: Collabora CODE service

This pull request adds the Collabora CODE service. It's an office suite usually used with Nextcloud.

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• This package is Open Source.
• The ansible role to install this package has been created.
• The documentation page for this package has been added.
• mkdocs.yml has been updated with a link to this package's documentation.
• The package has been added to group_vars/all under the # Enabled List, services:, and services: sections.
• The package has been added to group_vars/all as a standalone section.
• The package has been added to docs/index.md.
• The package has been added to CHANGELOG.md for the version currently in development.
• The package has been added to roles/homelabos_config/templates/config.yml.j2 under the # Services List section.
• The package has been added to roles/homelabos_config/templates/config.yml.j2 as a standalone section with subsection https_only and auth, if needed.
• This ansible template uses the password module for security.
• This Merge Request follows the contributing guidelines.

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After some testing it looks OK. I am able to edit Excel and Word documents.