Kottans also have JS chat room

A bunch of presenatations for Kottans JS, available at gh-pages.

Possible ways to contribute:

• Fix a typo/error in slides via regular PR
• Add slides link to the index.html page
• Add slides, following steps, described in dummy presentation.
• Use cleaver:
  1. Install cleaver (npm i -g cleaver).
  2. Create folder and .md file in it (sample).
  3. Run cleaver watch index.md and serve/access that file locally.