Moved most index-related files into index subdirectory.
Only index.html remains.

R=neil.fraser@gmail.com

Review URL: https://codereview.appspot.com/22590043

git-svn-id: http://blockly.googlecode.com/svn/trunk@1480 c400ca83-b69d-9dd7-9705-49c6b8615e23
Changed translation of "Turtle Graphics" at Russian translator's urging.
Details on request.

Review URL: https://codereview.appspot.com/22530044

git-svn-id: http://blockly.googlecode.com/svn/trunk@1481 c400ca83-b69d-9dd7-9705-49c6b8615e23
Additional change, per our Russian perfectionist.

Review URL: https://codereview.appspot.com/22910043

git-svn-id: http://blockly.googlecode.com/svn/trunk@1484 c400ca83-b69d-9dd7-9705-49c6b8615e23