Save resume data less frequently

[CeesJol]

On every save, the entire resume needs to be sent to the database, rather than just the new change. This is less efficient. To this end, the changes could only be sent to the database occasionally, rather than on each change. If the updates are frequent enough the user cannot lose much data. Plus a warning should then be sent if the user tries to leave the site and there are still unsaved changes. Finally, there should then be a button that allows you to save manually with a little confirmation text so you're sure your work is saved.