Improve the versioning when publishing the documentation

# Task Description

When the docs are published to GitHub Pages, use the release (tag) version.
When they are published from feature branches to Netlify, use the respective snapshot version.

# Open Questions

# Notes

# Task List

The following tasks will need to be carried out:
* [ ] Investigate the issue.
* [ ] Provide a solution.
* [ ] Test the fix.
* [ ] Update the documentation.

# Useful Commands

# Incurred Costs

# Task Relationships

This task:
* Is a sub-task of:
* Depends on:
* Is a follow-up of:
* #29
* Relates to:

# Resources

# Useful Links

# Points of Contact