[Pages] Page assets - manual mode

There is literally no reason for this feature to be limited to builder type pages. Please add it to manual mode, it saves quite a bit of hassle in adding assets for a given page. One still has to go and add the css/js to the template manager, so I have no idea why this is present in the 'easy' mode yet not the 'advanced' mode when it still requires the css/js be written or already exist, thus requiring advanced user involvement at some level anyway.