Disable deep profiler demo.

documentation/include/deep_demo.inc:
	Comment out deep profiler demo until we have it set up again.
Delete transition guide and Haskell comparison from Related page.

about/include/related.inc:
	As above.  They are out of place, and accessible via the
	Documentation page anyway.
Delete link to developer information on contributions page.

development/include/contributions.inc:
	As above.  The link is readily accessible from the sidebar
	anyway.
Update or delete old email addresses.

In cases where the replacement is not obvious I just deleted it; there
are enough contact methods scattered everywhere.

about/include/related.inc:
development/include/contributions.inc:
documentation/include/documentation.inc:
download/include/limitations.inc:
include/contact.inc:
	As above.