Restructure docs navigation for channel and widget guides

web/messages/en-US.json

@@ -926,7 +926,7 @@
     "emptyRows": "No matching users",
     "nicknameRequired": "Enter a nickname.",
     "usernameRequired": "Enter a username.",
-    "avatarInvalid": "Avatar URL must start with http or https.",
+    "avatarInvalid": "Invalid avatar.",
     "mobileInvalid": "Enter a valid phone number.",
     "emailInvalid": "Enter a valid email address.",
     "editTitle": "Edit User",
@@ -934,8 +934,8 @@
     "loading": "Loading...",
     "nickname": "Nickname",
     "nicknamePlaceholder": "Enter nickname",
-    "avatar": "Avatar URL",
-    "avatarPlaceholder": "Enter avatar URL",
+    "avatar": "Avatar",
+    "avatarPlaceholder": "Upload avatar",
     "mobile": "Mobile",
     "mobilePlaceholder": "Enter mobile number",
     "email": "Email",
@@ -948,7 +948,7 @@
     "username": "Username",
     "usernamePlaceholder": "Login name, required",
     "nicknameCreatePlaceholder": "Optional, defaults to username",
-    "avatarCreatePlaceholder": "Optional, http(s) URL",
+    "avatarCreatePlaceholder": "Upload avatar",
     "optional": "Optional",
     "remark": "Notes",
     "rolesOptional": "Roles (optional)",