mark sponsor descriptions with .prose so links get styled

Author: sodevious

src/sponsors/index.html

@@ -44,7 +44,7 @@ <h3 class="text-2xl lg:text-4xl font-heading">
                 <a href="{{ sponsor.data.url.target }}" class="inline-block text-xl link" aria-hidden="true">{{ sponsor.data.url.label }}</a>
               {% endif %}
               {% if sponsor.content %}
-                <div class="space-y-6 text-lg lg:text-xl">
+                <div class="space-y-6 prose lg:prose-lg">
                   {{ sponsor.content | markdown }}
                 </div>
               {% endif %}