Drop PGP signature of stable packages

They’re likely used by nobody. HTTPS and Microsoft/Apple code signing already
provide enough security.

setup-download-links.sh

@@ -34,10 +34,7 @@ for branch in release snapshot; do
                     ext=${BASH_REMATCH[2]}
                     echo "{% assign dynare_stable_version = \"$version\" %}" > ../dynare_stable_version.md
                 fi
-                {
-                    echo "<a href=\"https://www.dynare.org/$branch/$dir/$filename\">Dynare $version ($ext)</a> ($mb MB)"
-                    echo "<a href=\"https://www.dynare.org/$branch/$dir/$filename.sig\">[signature]</a>"
-                } >> "$includeFilename"
+                echo "<a href=\"https://www.dynare.org/$branch/$dir/$filename\">Dynare $version ($ext)</a> ($mb MB)" >> "$includeFilename"
             else
                 timestamp=${timestamps[i]%\"}
                 timestamp=${timestamp#\"}