new main nav menu, remove alpine

packages/website/app/modules/ui/popper.tsx

@@ -0,0 +1,41 @@
+import { useRect } from "@reach/rect"
+import * as React from "react"
+import { Portal } from "~/modules/dom/portal"
+
+export function Popper({
+  renderReference,
+  renderPopover,
+}: {
+  renderReference: (referenceProps: {
+    ref: (element: HTMLElement | null | undefined) => void
+  }) => React.ReactNode
+  renderPopover: () => React.ReactNode
+}) {
+  const [reference, referenceRef] = React.useState<HTMLElement | null>()
+  const referenceRect = useRect(useValueAsRefObject(reference))
+
+  return (
+    <>
+      {renderReference({ ref: referenceRef })}
+      <Portal>
+        {referenceRect && (
+          <div
+            className="fixed -translate-x-full"
+            style={{
+              left: referenceRect.right,
+              top: referenceRect.bottom + 16,
+            }}
+          >
+            {renderPopover()}
+          </div>
+        )}
+      </Portal>
+    </>
+  )
+}
+
+function useValueAsRefObject<Value>(value: Value): { readonly current: Value } {
+  const ref = React.useRef<Value>(value)
+  ref.current = value
+  return ref
+}