move doc to docs in order to accommodate rtd-bot

Author: gaborbernat

changelog/829.doc.rst

@@ -0,0 +1 @@
+document command line interface under the config section `cli <https://tox.readthedocs.io/en/latest/config.html?highlight=cli#cli>`_ - by :user:`gaborbernat`

doc/_static/custom.css renamed to docs/_static/custom.css

@@ -849,12 +849,6 @@ user can bypass the system's interpreter parser by defining the
 When the workaround is enabled, all tox-invoked text file executables will have
 their interpreter directive parsed by and explicitly executed by ``tox``.
 
-cli
-===
-
-.. autoprogram:: tox.cli:cli
-   :prog: tox
-
 Injected environment variables
 ------------------------------
 tox will inject the following environment variables that you can use to test that your command is running within tox:
@@ -875,4 +869,10 @@ Other Rules and notes
   it will be considered as relative to the ``toxinidir``, the directory
   where the configuration file resides.
 
+cli
+===
+
+.. autoprogram:: tox.cli:cli
+   :prog: tox
+
 .. include:: links.rst