I am implementing this! Thanx 
Small suggestion: add in the begging of your post some small installation instructions:
(e.g.)
Download myStyle.css and place it in OPENHAB_CONF/html/ directory (e.g. /etc/openhab2/html/) (or even better in a subdir of html)
Create a new HideHeader.html file (maybe give a download method also) in the same dir
Add a web element to the sitemap
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