Fix relative file paths

Fix path in include files to use them without calling from temlate.
Basic forum template

Created basic forum template with AngularJS and non-server rendering.
Loading topics, loading some of messages, loading more on scroll to the
end of page. Text editor - nicEdit. Added ability to upload images and
insert shared files from GoogleDrive + published iframes. + video from
YouTube.
TODO: edit/remove messages + edit/add topics.