Outdated onAppLaunched part is changed

I just started to a project with v2 and I realized this part of the documentation was wrong. I searched a bit and find this 2 commits: 

104e3f97fd

1d2680c5aa

So, that part is probably forgotten

I made the text a little more punchy and easy to read.

* Update Usage.md

* Remove passive voice

* update api jsdoc

* iniline some properties

* add typedoc

* remove typedoc

* try again with typedoc

* explicit types

* docs

* try handlerbars

* working on docs

* update docs

* html

* removed old md

* trying stuff

* fix lint

* working on docs

* trying with themes

* something works

* trying to use automatically

* working on docs

* docs

* docs

* docw

* auto docs

* rename

* local-docs no cache

* automating

* ts-node

* working on something cool

* temp

* try fix travis

* Revert "try fix travis"

This reverts commit 5bcb54659b.

* removed dead files

* main readme inside docs

* softlink

* softlink

* docs working