优化部署流程

.env.example

@@ -1,13 +1,11 @@
-PUBLIC_ORIGIN=https://blog.example.com
-SITE_ADDRESS=blog.example.com
+PUBLIC_ORIGIN=http://localhost
+SITE_ADDRESS=http://localhost:80
 SITE_TITLE=ChuBlog
-ADMIN_USERNAME=admin
-# Generate via the temporary API container in docs/deployment.md; keep single quotes around the hash.
-ADMIN_PASSWORD_HASH='$argon2id$REPLACE_WITH_GENERATED_HASH'
 ALLOW_REGISTRATION=true
-CHUSQL_ROOT_PASSWORD=replace-with-random-root-password-at-least-16-characters
-CHUSQL_PASSWORD=replace-with-different-random-index-password-at-least-16-characters
 SSH_PORT=2222
+# Generated automatically by deploy.sh on first deployment.
+CHUSQL_ROOT_PASSWORD=
+CHUSQL_PASSWORD=
 HTTP_PORT=80
 HTTPS_PORT=443