cache nvs term
minor header changes, tweaking links

Changed the title of the page; added a tip to the cfsn label; and made the whole
header (icon and name) a link to the home page.
Merge branch 'header-mods' of github.com:graybealski/cfsn into header-mods

Not sure why this is needed, maybe I did an amend somehow, or had an earlier commit.