Remove double build (#563)

* Remove double build

The docs are currently built twice, and as a result the docs also appear
on https://xtls.github.io/Xray-docs-next/

This doesn't seem necessary and the gh-pages branch of this repo can be
deleted. The real gh-pages branch is here:
https://github.com/XTLS/XTLS.github.io/tree/gh-pages-next

Deleting the gh-pages from this repo will also make clones faster

* accidentally removed install step

docs/.vuepress/config.ts

@@ -15,10 +15,8 @@ import i18nPlugin from "vuepress-plugin-i18n";
 const __dirname = getDirname(import.meta.url)
 console.log('>>> __dirname -> ', __dirname)
 const isProduction = process.env.NODE_ENV === "production";
-const forMainRepo = process.env.XRAY_DOCS_MAIN_REPO === "true";
 const useVite = process.env.XRAY_DOCS_USE_VITE === "true";
 
-console.log("base:", forMainRepo ? "/" : "/Xray-docs-next/");
 console.log(
   "bundler:",
   isProduction && !useVite ? "@vuepress/webpack" : "@vuepress/vite"
@@ -52,7 +50,7 @@ export default defineUserConfig(<UserConfig>{
       componentsDir: path.resolve(__dirname, './theme/components'),
     }),
   ],
-  base: forMainRepo ? "/" : "/Xray-docs-next/",
+  base: "/",
   locales: {
     "/": {
       lang: "zh-CN",