add user manual in app instead of pdf

src/node.h

@@ -43,6 +43,7 @@ enum class kAttribute : uint16_t
     Mips = const_hash("mips"),
     Default = const_hash("default"),
     RTL = const_hash("rtl"),
+    AutoSize = const_hash("autosize"),
 };
 
 enum class kWidget : uint16_t
@@ -83,6 +84,7 @@ enum class kWidget : uint16_t
     ColorPicker = const_hash("color-picker"),
     About = const_hash("about"),
     Changelog = const_hash("changelog"),
+    UserManual = const_hash("usermanual"),
 };
 
 class Node