www/pydio-cells: Fix build and overhaul
Pydio cells uses a custom version of packr to embed the static
resources into the `cells` binary. Previously, the embedding process
was not peformed, resulting in a non-functional binary. When trying
to use the app, user will just get "404 Not Found" error instead of
a web page.
To fix this - before the build `gmake generate` has to be performed
in the WRKSRC, and a special custom version of packr v1
(devel/pydio-packr) has to be used.
- DOCS option was removed, as the README.md file didn't really provide
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