Improve website publish script

Author: blikblum

docs/publish_website.js

@@ -1,10 +1,21 @@
 const ghpages = require('gh-pages');
 
+const { argv } = process;
+
+const message = argv.length > 2 ? argv[2] : undefined;
+
 ghpages.publish(
   '.',
   {
-    src: ['index.html', 'docs/*.html', 'docs/guide.pdf', 'demo/out.pdf'],
-    add: true
+    src: [
+      'index.html',
+      'docs/*.html',
+      'docs/img/*.png',
+      'docs/guide.pdf',
+      'demo/out.pdf'
+    ],
+    add: true,
+    message
   },
   function(err) {
     if (err) {