feat: add cpt webring

templates/footer.html

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         truncate(length=7, end="")}}</a>
     </p>
     <p style="margin-bottom: 0.5rem">
-        Member of the
+        Webrings:
         <a href="https://w.elr.sh">elr</a>
-        webring -
-        <span class='webring-links'>
-            <a href='javascript:void(0)' onclick='randomSite()'>random</a> |
-            <a href='#' id='prev-link'>previous</a> |
-            <a href='#' id='next-link'>next</a>
-        </span>
+        [<a href='javascript:void(0)' onclick='randomSite()'>random</a> |
+        <a href='#' id='prev-link'>prev</a> |
+        <a href='#' id='next-link'>next</a>] •
+        <a href="https://ctp-webr.ing">ctp</a>
+        [<a href="https://ctp-webr.ing/dunkirk/previous">prev</a> |
+        <a href="https://ctp-webr.ing/dunkirk/next">next</a>]
     </p>
     <p>
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