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

tsconfig.node.json

@@ -0,0 +1,11 @@
+{
+    "compilerOptions": {
+      "composite": true,
+      "skipLibCheck": true,
+      "module": "ESNext",
+      "moduleResolution": "bundler",
+      "allowSyntheticDefaultImports": true
+    },
+    "include": ["vite.config.ts"]
+  }
+