upload: create the correct record key

/404.html => `404` (special case)
/docs/index.html => `::docs::`
/cat.jpg => `::cat.jpg`

upload/src/main.rs

···
   let mut create_records = new_sitemap
     .into_iter()
     .map(|(k, v)| {
+      let k = if k == "404.html" {
+        String::from("404")
+      } else {
+        match k.strip_suffix("/index.html") {
+          Some(k) => format!("/{k}/"),
+          None => format!("/{k}"),
+        }
+      };
       let rkey =
         utils::url_to_rkey(k).wrap_err("Invalid file path. Could not be converted to rkey")?;
       let rkey = RecordKey(Rkey::new_owned(rkey).into_diagnostic()?);