customize site: light and dark theme

Author: wevertonbio

_pkgdown.yml

@@ -10,6 +10,8 @@ template:
     primary: "#007bff" # primary elements: blue
     input-bg: "#ffffff"     # color search bar
     input-color: "#212529"  # color text search bar
+    navbar-light-bg: "#007bff" #color for navbar when light
+    navbar-dark-bg: "#00008B" #color for navbar when dark
 
 # navigation bar configuration
 navbar: