Help: Simplify top-level index organization
Revise the organization introduced in commit 2c7cd95c (Help: Organize top-level index, 2013-10-28) to drop "Other Manuals" and put them in "Reference Manuals" because the distinction between them has blurred. Perhaps a better breakdown of the reference manuals will emerge in the future. While at it, sort the reference manual toctree by name.
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