Revert "Move the doc tree out into its own repo."

This reverts commit 8f88fcedd6.

doc-src/features/serverreplay.html

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+
+- command-line: _-S path_ 
+- mitmproxy shortcut: _S_
+
+Server-side replay lets us replay server responses from a saved HTTP
+conversation.
+
+Matching requests with responses
+--------------------------------
+
+By default, __mitmproxy__ excludes request headers when matching incoming
+requests with responses from the replay file. This works in most circumstances,
+and makes it possible to replay server responses in situations where request
+headers would naturally vary, e.g. using a different user agent. The _--rheader
+headername_ command-line option allows you to override this behaviour by
+specifying individual headers that should be included in matching.
+
+
+Response refreshing
+-------------------
+
+Simply replaying server responses without modification will often result in
+unexpected behaviour. For example cookie timeouts that were in the future at
+the time a conversation was recorded might be in the past at the time it is
+replayed. By default, __mitmproxy__ refreshes server responses before sending
+them to the client. The __date__, __expires__ and __last-modified__ headers are
+all updated to have the same relative time offset as they had at the time of
+recording. So, if they were in the past at the time of recording, they will be
+in the past at the time of replay, and vice versa. Cookie expiry times are
+updated in a similar way.
+
+You can turn off response refreshing using the _--norefresh_ argument, or using
+the _o_ options shortcut within __mitmproxy__.
+
+