search: search bar width fix

* Issue: ”tiny" search box width in Firefox (while OK in Chromium) #FIX
style: logo + header/footer + hmpg "middle" update

* header: updated logo + positioning/height
* footer: hide upperfoot
* “middle” homepage: hide collection list/testimonials + updated
entrypoints + styling
records: template updated

* demo iframe for visualisation added. replaced by “ispy”
* change layout according to issue #33
Merge pull request #36 from pamfilos/pu

overlay: updates for issue #33