Add topics for Gists (#413)

public/tailwind-embed.config.js

@@ -32,9 +32,9 @@ module.exports = {
         500: '#588fee',
         600: '#3c79e2',
         700: '#356fc0',
-        800: '#2d6195',
-        900: '#2a5574',
-        950: '#173040',
+        800: '#2b5da3',
+        900: '#1f4b8c',
+        950: '#192b57'
       },
 
       slate: colors.slate