remove link to index.htm that caused 404 error. Add links in Installing section.

@tomotaro1065 How to make changes to go in master & gh-pages simultaneously?
fix unclosed <a> tag
put Enide & NTS after Install button
Add Developers site; icons for Enide, NTS
Make left menu identical to main page. Correct intructions
remove  class="download"
remove  class="download"
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UTC
spelling
add Support options
Merge branch 'master' of https://github.com/Nodeclipse/www.nodeclipse.org.git
unordered list in SUPPORT
add links, small changes, clean-up
installation
add href="#support
Developing