Add link to signed policy

public/emelie/pgp/policy.html

@@ -46,6 +46,7 @@ This type of signature is used to certify that the key holder is a person I trus
 <h2 id="general">General</h2>
 
 <p>I appreciate if anyone whose keys I sign would return the favour and sign my keys in accordance with their own signing policy.</p>
+<p>A signed markdown version of this document can be found <a href="policy.md.asc">here.</a></p>
 
 <h2 id="changelog">Changelog</h2>