We no longer have two doc systems, move sphinx_doc_src back to doc_src

doc_src/cmds/cd.rst

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+.. _cmd-cd:
+
+cd - change directory
+=====================
+
+Synopsis
+--------
+
+::
+
+    cd [DIRECTORY]
+
+Description
+-----------
+``cd`` changes the current working directory.
+
+If ``DIRECTORY`` is supplied, it will become the new directory. If no parameter is given, the contents of the ``HOME`` environment variable will be used.
+
+If ``DIRECTORY`` is a relative path, the paths found in the ``CDPATH`` list will be tried as prefixes for the specified path, in addition to $PWD.
+
+Note that the shell will attempt to change directory without requiring ``cd`` if the name of a directory is provided (starting with ``.``, ``/`` or ``~``, or ending with ``/``).
+
+Fish also ships a wrapper function around the builtin ``cd`` that understands ``cd -`` as changing to the previous directory. See also :ref:`prevd <cmd-prevd>`. This wrapper function maintains a history of the 25 most recently visited directories in the ``$dirprev`` and ``$dirnext`` global variables. If you make those universal variables your ``cd`` history is shared among all fish instances.
+
+As a special case, ``cd .`` is equivalent to ``cd $PWD``, which is useful in cases where a mountpoint has been recycled or a directory has been removed and recreated.
+
+Examples
+--------
+
+
+
+::
+
+    cd
+    # changes the working directory to your home directory.
+    
+    cd /usr/src/fish-shell
+    # changes the working directory to /usr/src/fish-shell
+
+
+See Also
+--------
+
+See also the :ref:`cdh <cmd-cdh>` command for changing to a recently visited directory.