o2w generated package pages and repository index

RWO packages and their deps only; paths changed to name/name.version/
from name/version/; used:

$ opam2web -c content/ -o www --where pkg:core --where pkg:core_bench --where pkg:core_extended --where pkg:async --where pkg:utop --index all
Merge pull request #14 from dsheets/pkg

o2w generated package pages and repository index