Improve breadcrumbs and version verbiage

README.rst

@@ -21,16 +21,24 @@ your ``conf.py`` file:
 
     html_theme = "nextstrain-sphinx-theme"
 
-This theme is based on sphinx_rtd_theme_ and accepts all of the same
-`configuration options`_ settable via ``html_theme_option``.  Two additional
-options are supported:
+This theme is based on sphinx_rtd_theme_ and accepts most of the same
+`configuration options`_ settable via ``html_theme_option`` and a few
+additional options as well:
 
 :logo: Boolean determining if the Nextstrain logo should be displayed.
        Defaults to true.
 
 :logo_link: URL to use for the logo's link.  Defaults to
             <https://docs.nextstrain.org>.
 
+:logo_only: Ignored.  Inherited from sphinx_rtd_theme_.  Instead, the project
+            name and version info will not be displayed (thus showing only the
+            logo) when ``subproject`` is true.
+
+:subproject: Boolean determining if this is a subproject of the main Nextstrain
+             documentation project on <https://docs.nextstrain.org>.  Defaults
+             to true.
+
 If your project wants to display its own logo, just set Sphinx's ``html_logo``
 to point to the image file in your Sphinx project.
 

lib/nextstrain/sphinx/theme/layout.html

@@ -18,10 +18,6 @@
   by the theme *and also* can't refer to a theme-provided file when set by the
   doc project's conf.py.
 
-  `theme_logo_only` is set via a project's conf.py -> `html_theme_options` ->
-  `logo_only` value (default: false). In the context of Nextstrain we use this
-  to determine whether or not to display the subproject name, version
-
   We also adjust the rendering of the project name to remove the home icon.
 #}
 {% block sidebartitle %}
@@ -34,7 +30,7 @@
   </a>
 {% endif %}
 
-{% if not theme_logo_only %}
+{% if theme_subproject %}
   <div class="subproject">
     <a href="{{ pathto(master_doc) }}" class="project-name" alt="{{ _("Documentation Home") }}">
       {{ project }}

lib/nextstrain/sphinx/theme/theme.conf

@@ -8,3 +8,4 @@ pygments_style = default
 style_nav_header_background = #f2f2f2
 logo = True
 logo_link = https://docs.nextstrain.org
+subproject = True