README markdown changes to allow the release-util.sh script to work.

Added the dist/release-utils.sh script that builds README.html from Markdown.
The script chokes on a few things, so made the following modifications.

* The triple tick marks causes an exception,, so I removed them and indented 8 spaces instead.
* Added a blank like after each heading so the next line is not appended.
* Replaced some quickstart names with links to the quickstart README files.
* Removed sections that are not applicable to these quickstarts.
* Fixed some broken links.
* Also did minor text changes.