Cosmetic makefile changes
Correct index.html makefile rule
Simplify some make dependencies
Change default make action to generating site
Don't use absolute path for base directory

If the absolute path is used, it is needed when building that file with
make.
Rename "less" target to "css"

Name the phony target after what is being built.
Merge branch 'makefile-update'
Post: Dynamic refiling targets for Org headings