Fix the docs index page logo size

Fixes the size of the logo on the index page of the documentation.
On mobile or small windows, this logo would be too large.

This adds a rule to the CSS for that logo that fixes it's size.

docs/_template/light-dark-theme/styles/master.css

@@ -39,6 +39,7 @@ img {
     width: 951pt;
     /* Height was arbitrarily determined */
     min-height: 100pt;
+    max-width: 90%;
 }
 
 article.content p{