config: fix building of index.html in watch mode (do not cache data.json)

templates/index.js

@@ -1,10 +1,11 @@
 const handlebars = require('handlebars');
 const path = require('path');
 const fs = require('fs');
-const data = require('./data');
 const packageJson = require('../package');
 
 function compile(isDevMode = false) {
+  const dataPath = path.resolve(__dirname, 'data.json');
+  const data = JSON.parse(fs.readFileSync(dataPath).toString());
   const templatePath = path.resolve(__dirname, 'index.html.handlebars');
   const template = fs.readFileSync(templatePath).toString();
   const delegate = handlebars.compile(template);