Switch to sphinx+rtd for documentation

- mkdocs doesn't support GFMD, so is a different dialect
- recommonmark seems abandoned
- Couldn't get m2r to work

So RST + Sphinx it is!

docs/conf.py

@@ -0,0 +1,32 @@
+from recommonmark.parser import CommonMarkParser
+from recommonmark.transform import AutoStructify
+
+# Support markdown too
+source_suffix = ['.rst']
+
+project = 'The Littlest JupyterHub'
+copyright = '2018, JupyterHub Team'
+author = 'JupyterHub Team'
+
+# The short X.Y version
+version = ''
+# The full version, including alpha/beta/rc tags
+release = 'v0.1'
+
+# The master toctree document.
+master_doc = 'index'
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+# This pattern also affects html_static_path and html_extra_path .
+exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = 'sphinx'
+
+html_theme = 'alabaster'
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+html_static_path = ['_static']