initial sphinx documentation commit
add: first draft of main categories
add RTD theme
add documentation widgets pages
add event-spec doc
add doc (overview page)
add doc (glossary)
add changelogs doc
fix typo in changelogs doc
add doc (install from packages)
add doc (install from source & canopsis on boot)
add doc (admin-howto)
add doc (rest api)
improve doc (overview)
add doc (uninstall, upgrade canopsis)
add: documentation (widgets texts)
add images in widgets documentation
add: documentation (calendar screenshots)
add create your own widgets documentation
add room for menu documentation