add page to contain raw content

This page can be used for pregenerated HTML, or HTML generated by things
like Pod::Simple::XHTML. It also could be used for things that are not
HTML.

It probably should not be used for static files. The static app will
probably do a better job.
add initial progress on Perldoc app

This app will display the POD of a given set of modules in HTML format.
Good if you're building the website of a Perl project.

Refs #16
rewrite links to internal modules

If we're covering the module locally, we should rewrite the link to be a
local link.
weave the POD before trying to make HTML

This is a huge copy/paste from Dist::Zilla::Plugin::PodWeaver and
Pod::Elemental::PerlMunger (since the latter is a Moose::Role and we
don't want to use Moose in here).

This needs to be made an optional thing, because there are a lot of
prereqs required in order to do this:

* PPI
* Pod::Elemental
* Pod::Weaver

Which, combined, are probably half of CPAN...