[wiki] remove dead ocaml install instructions
[wiki] replace dead install file with current instructions
[install] i use, and so it's tested on, 10.7.5
[install] whitespace
[install] need to work around system compiler/ocamlfind install locations
[git] ignore mirari dropping
[install] split into separate wiki entries
[install] tidying up and updating, mostly mirage-www
[dispatch] whitespace