[Navigation, Footer] Landing pages

[jorjo1]

These are missing

[mammuth]

Big header & Footer saying "ENTER PAGE"

[sacdallago]

Me likey likey but @gyachdav not likey likey

[marcusnovotny]

copying from #169

The "Enter Page" button is a start but not really inviting. Why not just implement the whole header, so people see immediately that they can look up characters and there's some sort of Map / ranking?

Also, still mistakes in the landing pages (Alt text displayed as regular text, buggy twitter images eg. for Jon Snow...)