Simple sphinx settings to improve navigation (#93)

* Quality of life options for sidebar and navigation

* Clarify what the defaults were

* Keep nav depth at default 4 because page sections are long atm

docs/source/conf.py

@@ -93,8 +93,10 @@
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
 # documentation.
-#
-# html_theme_options = {}
+html_theme_options = {
+    'collapse_navigation': False, # now show the [+] icon to expand headings in the sidebar. Default=True
+    'prev_next_buttons_location': 'both' # helps quicken skimming through doc pages. Default='bottom'
+}
 
 # 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,