closes#1751
Move additional styles from `sample.css` to `hero-search.component.css`.
Edit tutorial to reflect the removal of `sample.css` and the change to `heroes.component.css`.
Edit tutorial to reflect the addition of `hero-search.component.css` file.
Edit `hero-search.component.ts` to include styles from `hero-search.component.css`.
Remove reference to `/public/docs/_examples/toh-6/ts/sample.css` from `/public/docs/_examples/toh-6/ts/index.html`.
Adam