New Theme Documentation

Changelog:

• 03.12.18

• added JetProductGallery documentation;

• added CrocoBlock changelog;

• added JetSmartFilters update documentation;

• added external link into php by Photon;

• added external links to Jet plugin projects.

• 09.11.18

• added Popup trigger event on custom selector click in triggers.

• 08.11.18

• added multi-field MailChimp section to JetPopup documentation.

• 01.11.18

• added Horozontal Timeline widget documentation for JetElements plugin.