Invisible tooltip text and javascript crash

1. The HTML entities are causing Javascript to crash when combined with XHTML. When using unicode I don't really see the point of using entities anyways, so replaced them with the actual characters
2. My page is light text on dark background. Intro.js tooltip background was set to white, but no text color was defined, so the text ended up being invisible. Defined the tooltip color as black so it is sure to be contrast to the white.