fix: gh icon as relative path (#170)

Author: jo-mueller

pre_build.py

@@ -178,7 +178,6 @@ def render_authors_md():
     # The invertocat icon was downloaded from https://brand.github.com/foundations/logo
     # and colored in grey according to the guidelines under the "Color" section.
     orcid_icon = "https://orcid.org/assets/vectors/orcid.logo.icon.svg"
-    github_icon = "icons/invertocat.svg"
 
     for idx, author in enumerate(authors):
         name = author['name']
@@ -187,7 +186,7 @@ def render_authors_md():
             name += f" [<img src=\"{orcid_icon}\" alt=\"ORCID iD\" height=12 width=12 style=\"vertical-align: middle;\"/>](https://orcid.org/{author['orcid']})"
 
         if "github" in author:
-            name += f" [<img src=\"{github_icon}\" alt=\"GitHub\" height=12 width=12 style=\"vertical-align: middle;\"/>](https://github.com/{author['github']})"
+            name += f" [<img src=icons/invertocat.svg alt=\"GitHub\" height=12 width=12 style=\"vertical-align: middle;\"/>](https://github.com/{author['github']})"
 
 
         if idx == len(authors) - 1: