Docs: manual fix of built link to cheatsheet

docs/cheat_sheet.html

@@ -133,7 +133,7 @@ <h3>Related Topics</h3>
 <p>Version 3.16.2 for version 1.11 of the CF conventions.</p>
 <p>This cheat sheet provides a summary of some key functions and methods in
 cf-python (also available as a printable PDF for
-<a class="reference download internal" download="" href="_downloads/8683cc7ed97b754fffeacb09b2521112/cheatsheet.pdf"><code class="xref download docutils literal notranslate"><span class="pre">pdf</span></code></a>).</p>
+<a class="reference download internal" download="" href="_downloads/cheatsheet.pdf"><code class="xref download docutils literal notranslate"><span class="pre">pdf</span></code></a>).</p>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 32%" />
@@ -440,4 +440,4 @@ <h3>Related Topics</h3>
 
 
   </body>
-</html>
+</html>