start work on sidenotes

src/middleware.ts

@@ -0,0 +1,7 @@
+import { defineMiddleware } from 'astro:middleware';
+
+// set SIDENOTE_COUNT to 0 at the start of every request so that as sidenotes are rendered, it only counts them on the current page
+export const onRequest = defineMiddleware((_context, next) => {
+    globalThis.SIDENOTE_COUNT = 0;
+    return next();
+})