About: added link to Release Notes

* Changed other links to text links.
About: further tweaking text
Added Battery Glyphs in preparation for display of battery percentage.
Prep work for battery status in button bar.
Changed battery glyph to `visibility:hidden`

That way the CSS and HTML can stay enabled. When we are ready to add code to ui-utils.js we can just start running.
lower case api-secret header just incase some server or user agent does wierd things
Merge branch 'rebase/settings' of github.com:nightscout/cgm-remote-monitor into rebase/settings
Last Entry: out of date colored backgrounds

Adding warning + urgent colored backgrounds when BG is out of date by 10 or 20 minutes.
no message
Stale data: strikethrough when 20 minutes out of date
Settings: Patient Name

For parents monitoring multiple kids. Replaces "Nightscout" in the toolbar.
Settings: renamed Patient Name -> Custom Title
Adding custom title to page title
Status layout: removed unnecessary font shrinkage step.