Add rel=me to staff members' own website links

The `rel=me` is used to indicate profile equivalence [0] and is used
by Mastodon's Link Verification [1]. If a staff member puts a link to
their Fediverse account in the "website" field and cross-links the
staff page on their Fediverse account (the link may include
`#username` anchor) then the software will display the link as "green"
thus giving others an indication that this person is indeed an Arch
staff member.

[0]: https://microformats.org/wiki/rel-me
[1]: https://docs.joinmastodon.org/user/profile/#verification

templates/public/developer_list.html

@@ -47,7 +47,7 @@ <h3>{{ dev.get_full_name }}{% if prof.latin_name %} ({{ prof.latin_name}}){% end
                 </tr><tr>
                     <th>Website:</th>
                     <td>{% if prof.website %}<a itemprop="url" href="{{ prof.website }}"
-                            title="Visit the website for {{ dev.get_full_name }}">
+                            title="Visit the website for {{ dev.get_full_name }}" rel="me">
                             {{ prof.website }}</a>{% endif %}</td>
                 </tr><tr>
                     <th>Occupation:</th>