How to create header, footer and style overrides.

Override files can be created to retain customizations during updates. 

1. Files are located in "overrides" folder inside Hexa template. Rename header.tpl.new to header.tpl. Optionally rename footer.tpl.new to footer.tpl and style.css.new to style.css. 
2. Files can be edited now and will be used as overrides that will not be overwritten during updates.