ssb: Add a manual theme color picker.

apps/ssb/script.js

@@ -18,5 +18,8 @@ import * as tf_styles from './tf-styles.js';
 window.addEventListener('load', function () {
 	let style = document.createElement('style');
 	style.innerText = tf_styles.styles;
+	Promise.resolve(tf_styles.generate_theme()).then(function (x) {
+		style.innerText += x;
+	});
 	document.body.appendChild(style);
 });