Vite + TypeScript (#836)

Resolves #803

This is an initial commit to allow migrating to typescript bit by bit.
It introduces vite.
It removes all the webpack configuration (which I have no clue what all
the profiling are needed for, and couldn't find anything in the readme).
It also changes a single file from javascript to typescript:
`urlopen.js` -> `urlopen.ts`
Which was done manually, later on I'll see if I can automate most of the
migration.
For now, everything seems to work as expected.
I also upgrades storybook to use vite and renames the stories to jsx (I
honestly don't know why this complexity is needed here, but I'll keep it
for now).

cc: @damianstasik

.storybook/main.js

@@ -1,24 +1,9 @@
-const rules = require('../config/webpack.rules');
-
-module.exports = {
-  stories: ['../stories/**/*.stories.js'],
-  addons: [
-    '@storybook/addon-actions',
-    '@storybook/addon-links',
-    '@storybook/addon-a11y/register',
-    '@storybook/addon-storysource',
-  ],
-  webpackFinal: async config => {
-    // do mutation to the config
-    console.log("config.module", config.module);
-
-    return {
-      ...config,
-      module: {
-        rules: [
-          ...rules,
-        ]
-      }
-    };
-  },
+const config = {
+  stories: ['../stories/**/*.stories.jsx'],
+  addons: ['@storybook/addon-actions', '@storybook/addon-links', '@storybook/addon-a11y/register', '@storybook/addon-storysource'],
+  framework: {
+    name: '@storybook/react-vite',
+    options: {}
+  }
 };
+export default config;