Add Kite start page as index.html.

The existing index has been moved to all-pages.md. This needs to be
improved before committing, possibly by organizing all pages and adding
a sidebar rather than using all-pages directly.
Adding maven plugin pages.

These are generated using the maven-genearted content as an included
HTML blob. The README explains how to depend on the maven content. The
content should be generated using the empty-maven-skin.

For the links from maven to work without modification, this removes the
"pretty" permalink option. Links throughout the other content must be
updated.
Add morphlines docs from maven-generated site.
Adding markdown pages from kite-data.

Limitations has been updated (two limitations removed!) and release
notes has been largely unchanged. The other files were imported as
"original-<title>" until we can update them.
Minor fixes.