Readme changes (#266)
Readme changes (#266)

[skip ci]
* Update to readme - passed through Hemmingway etc.

* Updated TOC

* Updated TOC again

* Consistent use of event handler vs listener.

* More consistent naming for examples

* More intuative flow about properties events.

* Typos

* Feedback

* toc work

* More toc link fixes

* Update README.md

* Update README.md

* Removed double space typo. Changed comments to be invisible. Removed references to render lifecycle.

edhager/widget-core,edhager/widget-core,edhager/widget-core,edhager/widget-core