docs: add GitLab and Gitea logos

docs.json

@@ -171,7 +171,12 @@
       {
         "label": "项目源码",
         "href": "https://gitea.kenanzhu.com/AutoLibrary/AutoLibrary",
-        "icon": "code"
+        "icon": "/images/repositories/gitea.svg"
+      },
+      {
+        "label": "手册源码",
+        "href": "https://gitlab.com/KenanZhu/AutoLibraryManuals",
+        "icon": "/images/repositories/gitlab.svg"
       }
     ]
   },