chore(APIs doc): move the Call User API doc to wikis

The new location of the doc: https://github.com/mykabam/kabam-plugin-webrtc/wiki/APIs-Documentation#call-user
chore(APIs doc): move the Recording Message API doc to wikis

The new location of the doc: https://github.com/mykabam/kabam-plugin-webrtc/tree/chore-docs#recording-message-api
Merge branch 'chore-docs' into 0.4.0-alpha.2
chore(*): add .npmignore