It turns out that the RDAP spec does not envision multiple help pages. We can
still support them (for the TOS, for instance), but we shouldn't expect users
to go searching for help other than the main page. Therefore, consolidate the
useful information on the main page, and get rid of some of the others.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=178792548