highlight actual fingerprints

It has always been possible to generate keys with the same key ID (it's only 32 Bit, duh). There has now been a public demonstration of just that.
Do what we should have done ages ago by listing the full fingerprint only.

style.css

@@ -149,3 +149,8 @@ code.commands {
     background: rgba(200, 200, 200, 0.4);
     white-space: pre;
 }
+
+code.fingerprint {
+	font-weight: bold;
+	font-size: 140%;
+}