Uupdate base url to deploy to typespec.io (#2806)

.github/workflows/website-gh-pages.yml

@@ -37,7 +37,8 @@ jobs:
       - name: Build
         run: node common/scripts/install-run-rush.js build --to @typespec/website -v
         env:
-          TYPESPEC_WEBSITE_BASE_PATH: "/typespec/"
+          # Only when deploying to microsoft.github.io/typespec. For typespec.io use the default value.
+          # TYPESPEC_WEBSITE_BASE_PATH: "/typespec/"
           NODE_OPTIONS: "--max_old_space_size=4096"
 
       - name: Upload artifact