Move all files out of ext/Pod-Html.
Add a README in github markdown format.
Add MANIFEST, Makefile.PL; update .gitignore.
Introduce Pod::Html::Auxiliary; move usage() there.

Pod::Html::Auxiliary will hold non-object-oriented functions.  Move usage()
there.  Add a test file for usage().
Move anchorify(), htmlify(), html_escape() to Auxiliary.pm.

Add t/601_anchorify.t.
Move t/anchorify.t to t/601_anchorify.t.
Move Pod::Html::_unixify to Pod::Html::Auxiliary::unixify.
Add file to test unixify().
Move relativize_url() to Pod::Html::Auxiliary.

Add a test file -- currently just a placeholder -- for relativize_url().
Start to encapsulate package-scoped variables.

Create a $self (hashref) and stuff 18 package-scoped 'my' variables into it.
$self will eventually become an object.
Move @Podpath into $self.
Use $self as argument to three internal subroutines.