Copy doc_src to sphinx_doc_src and add a TOC

sphinx_doc_src/cmds/dirs.rst

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+\section dirs dirs - print directory stack
+
+\subsection dirs-synopsis Synopsis
+\fish{synopsis}
+dirs
+dirs -c
+\endfish
+
+\subsection dirs-description Description
+
+`dirs` prints the current directory stack, as created by the <a href="#pushd">`pushd`</a> command.
+
+With "-c", it clears the directory stack instead.
+
+`dirs` does not accept any parameters.