fix(config): update theme variable to themes for fetching theme page as a regard to dir name

Author: andatoshiki

src/workers/index.js

@@ -1,6 +1,6 @@
 const config = {
 	no_ref: 'off', // control the HTTP referrer header, if you want to create an anonymous link that will hide the HTTP Referer header, please set to "on"
-	theme: '', // homepage theme, use the empty value for default theme. To use urlcool theme, please fill with "theme/urlcool"
+	themes: '', // homepage themes, use the empty value for default themes. To use urlcool themes, please fill with "themes/urlcool"
 	cors: 'on', // allow Cross-origin resource sharing for API requests
 	unique_link: true, // if it is true, the same long url will be shorten into the same short url
 	custom_link: false, // allow users to customize the short url.
@@ -154,7 +154,7 @@ async function handleRequest(request) {
 
 	console.log(path)
 	if (!path) {
-		const html = await fetch('https://xytom.github.io/Url-Shorten-Worker/' + config.theme + '/index.html')
+		const html = await fetch('https://xytom.github.io/Url-Shorten-Worker/' + config.themes + '/index.html')
 
 		return new Response(await html.text(), {
 			headers: {