add entry hook for web

src/components/hooks/useStarterPackEntry.ts

@@ -0,0 +1,15 @@
+import React from 'react'
+
+import {useSetStarterPack} from 'state/preferences/starter-pack'
+
+export function useStarterPackEntry() {
+  const setStarterPack = useSetStarterPack()
+
+  React.useEffect(() => {
+    const url = new URL(window.location.href)
+    const pathParts = url.pathname.split('/')
+    if (pathParts[0] === 'start' && pathParts.length === 2) {
+      setStarterPack(pathParts[1])
+    }
+  }, [setStarterPack])
+}