🩹📝 fix docs PDF build (#19)

Author: burgholzer

docs/conf.py

@@ -131,6 +131,7 @@ def format_url(self, _e: Entry) -> HRef:  # noqa: PLR6301
     "releasename": "Version",
     "printindex": r"\footnotesize\raggedright\printindex",
     "tableofcontents": "",
+    "sphinxsetup": "iconpackage=fontawesome",
     "extrapackages": r"\usepackage{qrcode,graphicx,calc,amsthm,etoolbox,flushend}",
     "preamble": r"""
 \patchcmd{\thebibliography}{\addcontentsline{toc}{section}{\refname}}{}{}{}