Add Sitemap for Netlify support

Author: bxx-114514

src/.vuepress/config.ts

@@ -2,8 +2,10 @@ import { defineUserConfig } from "vuepress";
 
 import theme from "./theme.js";
 
+const isNetlify = process.env.NETLIFY_CNAME;
+
 export default defineUserConfig({
-  base: "/",
+  base: isNetlify ? '/' : '/',
 
   lang: "zh-CN",
   title: "bxx-114514 的留档博客",

src/.vuepress/theme.ts

@@ -3,8 +3,10 @@ import { hopeTheme } from "vuepress-theme-hope";
 import navbar from "./navbar.js";
 import sidebar from "./sidebar.js";
 
+const isNetlify = process.env.NETLIFY_CNAME;
+
 export default hopeTheme({
-  hostname: "https://bxx-114514.github.io",
+  hostname: isNetlify ? 'https://bxx114514.netlify.app' : 'https://bxx-114514.github.io/',
 
   author: {
     name: "천화(天華)SRSH",