Add copyright line to theme

themes/paperesque/layouts/_default/single.html

@@ -15,6 +15,7 @@ and you can test on the android-development-developer-productivity article.
 Would also be cool to make this fold on mobile so there's two links on separate lines.
 -->
   {{if (and (not .Parent.IsHome) (or .PrevInSection .NextInSection)) }}
+    <p style="text-align: center;">© CC-BY-SA 4.0</p>
     <div class="nav-bkg-50 content-container-narrow-pad bottom-links text-0p75">
       <nav class="flex-row">
       {{if .PrevInSection}}