🩹 📝 removes the hmtl_baseurl setting from RtD config (#314)

## Description

Sphinx recommends not setting `hmtl_baseurl` so that RtD can figure it
out on its own.

## Checklist:

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- [x] The pull request only contains commits that are related to it.
- [x] I have added appropriate tests and documentation.
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- [x] The pull request introduces no new warnings and follows the
project's style guidelines.

Signed-off-by: burgholzer <burgholzer@me.com>

docs/source/conf.py

@@ -132,7 +132,6 @@ def format_url(self, _e: Entry) -> HRef:
 
 # -- Options for HTML output -------------------------------------------------
 html_theme = "furo"
-html_baseurl = "https://mqt.readthedocs.io/project/qcec/en/latest/"
 html_static_path = ["_static"]
 html_theme_options = {
     "light_logo": "mqt_dark.png",