[DOC] Lecture tools documentation

-added new screenshots for exiting tools
-added offline version

[DOC] conference tools documentation

-alarm conference was missing
-badge conference was missing icon
-added offline website generation
-updates rest of tools images

[DOC] meeting tools documentation

-reordered tabs properly (were in a strange order)
-added documentation for offline
[DOC] vidyo search option
[DOC] Rich abstract editor
[DOC] Moved Alarm Control to Conferences guide
[DOC] Rewording
[DOC] Moved offline website to conferences guide
[DOC] Some pics downscaled to fit in page
[IMP] .travis.yml added
Update