upload: fix edge case for /index.html

tldr: the key mapper stripped /index.html, to ensure the entire segment was an index.html at the end and to avoid conflict
because the root of the site wasnt prefixed with a / before mapping, a path of index.html would just get mapped to path /index.html instead of /
fix: add special case for index.html
also make it a map bc more special cases may be added

upload/Cargo.lock

···
 
 [[package]]
 name = "atcities-upload"
-version = "1.0.0"
+version = "1.0.1"
 dependencies = [
  "clap",
  "env_logger",

upload/Cargo.toml

···
 
 [package]
 name = "atcities-upload"
-version = "1.0.0"
+version = "1.0.1"
 edition = "2024"
 
 [dependencies]

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") {
+      let k = match k.as_str() {
+        "404.html" => String::from("404"),
+        "index.html" => String::from("/"),
+        _ => match k.strip_suffix("/index.html") {
           Some(k) => format!("/{k}/"),
           None => format!("/{k}"),
         }