Move html-js and html-css classes from mmm-erb to mmm-sample

* Overwrite JS and CSS classes that were already there.

* Disregard type and language attributes. The latter is obsolete, the former is
  made optional in HTML5. If we're ever going to dispatch to appropriate submode
  based on attribute value, we can add them back.

* No submode regions for inline code in on* attributes, the added functionality
  is not worth the slowdown (font-lock and indentation are largely unused), and
  such attributes are bad practice anyway.
Remove the useless CVS $Id tags
Update NEWS