Fix/auth test

[martinhjel]

Closes #43 .

Changes proposed in this Pull Request

• Make streamlit authentication optional.
• Fix issue with not writing config.txt for test runs.

Checklist

• [x] I have read the CONTRIBUTING document.
• [x] I consent to the release of this PR's code under the MIT license.
• [x] My code follows the code style of this project.
• [] I have added tests to cover my changes.
• [ ] All new and existing tests passed.
• [x] I have updated the documentation accordingly.
• [x] Newly introduced dependencies are added to environment.yml and docs/requirements.txt.
• [x] A note for the release notes docs/source/release_notes.rst is amended in the format of previous release notes, including reference to the requested PR.