Updated Sphinx RTD documentation theme supports 4 levels

lib/spack/docs/conf.py

@@ -87,7 +87,7 @@
 source_suffix = '.rst'
 
 # The encoding of source files.
-#source_encoding = 'utf-8-sig'
+source_encoding = 'utf-8-sig'
 
 # The master toctree document.
 master_doc = 'index'
@@ -149,7 +149,7 @@
 # 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 = [('show_copyright', False)]
 
 # Add any paths that contain custom themes here, relative to this directory.
 html_theme_path = ["_themes"]