Documentation and clean up of ctb-oda Web Component

[geertjanw]

Probably, though I could be wrong, not all the files are needed in the Web Component, e.g., the HTML file and CSS file, also documentation needs to be provided in the README of the ctb-oda Web Component -- for both points, see the below:

https://github.com/Oracle-JET-Community/Web-Component-Repository/tree/master/my-pasta-chat

Notice that the loader only loads the file that is needed:

https://github.com/Oracle-JET-Community/Web-Component-Repository/blob/master/my-pasta-chat/loader.js

This makes for a cleaner Web Component.