Fix accessibility issue with top-level breadcrumb in ReadTheDocs theme (

#3129)

Change top-level breadcrumb link's inappropriate alt tag to aria-label for accessibility

Co-authored-by: Oleh Prypin <oleh@pryp.in>

mkdocs/themes/readthedocs/breadcrumbs.html

@@ -1,6 +1,6 @@
 <div role="navigation" aria-label="breadcrumbs navigation">
   <ul class="wy-breadcrumbs">
-    <li><a href="{{ nav.homepage.url|url }}" class="icon icon-home" alt="{% trans %}Docs{% endtrans %}"></a> &raquo;</li>
+    <li><a href="{{ nav.homepage.url|url }}" class="icon icon-home" aria-label="{% trans %}Docs{% endtrans %}"></a> &raquo;</li>
     {%- if page %}
       {%- for doc in page.ancestors[::-1] %}
         {%- if doc.link %}