update header color for 4.1v (#106)

Author: Arhell

Diff for: mkdocs.yml

@@ -51,14 +51,14 @@ theme:
         name: Switch to light mode
     - media: "(prefers-color-scheme: light)"
       scheme: default
-      primary: teal
+      primary: custom
       accent: teal
       toggle:
         icon: material/toggle-switch
         name: Switch to dark mode
     - media: "(prefers-color-scheme: dark)"
       scheme: slate
-      primary: black
+      primary: custom
       accent: teal
       toggle:
         icon: material/toggle-switch-off