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

stories/ui.jsx

@@ -0,0 +1,27 @@
+import React from 'react';
+
+
+export function Describe ({children}) {
+  return (
+    <div style={{maxWidth: "600px", margin: "0.8em"}}>
+      {children}
+    </div>
+  )
+}
+
+export function Wrapper ({children}) {
+  return (
+    <div style={{maxWidth: "260px", margin: "0.4em"}}>
+      {children}
+    </div>
+  );
+};
+
+export function InputContainer ({children}) {
+  return (
+    <div style={{maxWidth: "171px", margin: "0.4em"}}>
+      {children}
+    </div>
+  );
+};
+