Converted protocols to mdbook.

Started an introductory section too.

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diff --git a/docs/man/nng_respondent.7.adoc b/docs/man/nng_respondent.7.adoc
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--- a/docs/man/nng_respondent.7.adoc
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-= nng_respondent(7)
-//
-// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
-// Copyright 2018 Capitar IT Group BV <info@capitar.com>
-//
-// This document is supplied under the terms of the MIT License, a
-// copy of which should be located in the distribution where this
-// file was obtained (LICENSE.txt).  A copy of the license may also be
-// found online at https://opensource.org/licenses/MIT.
-//
-
-== NAME
-
-nng_respondent - respondent protocol
-
-== SYNOPSIS
-
-[source,c]
-----
-#include <nng/protocol/survey0/respond.h>
-----
-
-== DESCRIPTION
-
-(((protocol, _respondent_)))
-The ((_respondent_ protocol)) is one half of a ((survey pattern)).
-In this pattern, a surveyor sends a survey, which is broadcast to all
-peer respondents.
-The respondents then have a chance to reply (but are not obliged to reply).
-The survey itself is a timed event, so that responses
-received after the survey has finished are discarded.
-
-TIP: This protocol is useful in solving voting problems, such as leader
-election in cluster configurations, as well as certain kinds of service
-discovery problems.
-
-The _respondent_ protocol is the respondent side, and the
-xref:nng_surveyor.7.adoc[_surveyor_] protocol is the surveyor side.
-
-=== Socket Operations
-
-The xref:nng_respondent_open.3.adoc[`nng_respondent0_open()`] functions create a
-respondent socket.
-This socket may be used to receive messages, and then to send replies.
-A reply can only be sent after receiving a survey, and generally the
-reply will be sent to surveyor from whom the last survey was received.
-
-Respondents may discard a survey by simply not replying to it.
-
-Raw mode sockets (set with xref:nng_options.5.adoc#NNG_OPT_RAW[`NNG_OPT_RAW`])
-ignore all these restrictions.
-
-=== Context Operations
-
-This protocol supports the creation of xref:nng_ctx.5.adoc[contexts] for concurrent
-use cases using xref:nng_ctx_open.3.adoc[`nng_ctx_open()`].
-
-Incoming surveys will be routed to and received by only one context.
-Additional surveys may be received by other contexts in parallel.
-Replies made using a context will be returned to the the surveyor that
-issued the survey most recently received by that context.
-The restrictions for order of operations with sockets apply equally
-well for contexts, except that each context will be treated as if it were
-a separate socket.
-
-=== Protocol Versions
-
-Only version 0 of this protocol is supported.
-(At the time of writing, no other versions of this protocol have been defined.
-An earlier and incompatible version of the protocol was used in older
-pre-releases of http://nanomsg.org[nanomsg], but was not released in any
-production version.)
-
-=== Protocol Options
-
-The _respondent_ protocol has no protocol-specific options.
-
-=== Protocol Headers
-
-(((backtrace)))
-The _respondent_ protocol uses a _backtrace_ in the header.
-This is more fully documented in the xref:nng_surveyor.7.adoc[_surveyor_] manual.
-
-// TODO: Insert reference to RFC.
-
-== SEE ALSO
-
-[.text-left]
-xref:nng_respondent_open.3.adoc[nng_respondent_open(3)],
-xref:nng_surveyor.7.adoc[nng_surveyor(7)],
-xref:nng.7.adoc[nng(7)]