docs: Fix tutorial deployment

Author: manthey

tutorials/index.js

@@ -23,6 +23,12 @@ require('codemirror/addon/fold/foldcode');
 require('codemirror/addon/fold/foldgutter');
 require('codemirror/addon/edit/matchbrackets');
 
+// Colorbrewer
+window.colorbrewer = require('colorbrewer').default;
+
+// d3
+window.d3 = require('d3');
+
 // common tutorial code
 require('./common/tutorials.css');
 window.start_tutorial = require('./common/tutorials');