Add rails v7.1.0

Author: toshimaru

_config.yml

@@ -2,8 +2,10 @@ title: RailsDoc(β)
 description: Ruby on Rails API Documentation.
 url: https://railsdoc.github.io
 source: src
-default_rails_version: 7.0.4
+default_rails_version: 7.1.0
 rails_versions:
+  "7.0":
+    specific_version: "7.0.8"
   "6.1":
     specific_version: "6.1.7"
   "6.0":
@@ -24,10 +26,15 @@ defaults:
   - scope:
       path: ""
     values:
-      version: 7.0
+      version: 7.1
       image: https://avatars.githubusercontent.com/u/4223
       toc: true
       root_path: '/'
+  - scope:
+      path: "7.0"
+    values:
+      version: 7.0
+      root_path: '/7.0/'
   - scope:
       path: "6.1"
     values: