r/gitea: use sshd_config.d

Recent(-ish) versions of Fedora have a drop-in configuration directory
for `sshd`.  This allows applications, etc. to define certain settings
for the SSH server, without having to manage the entire server
configuration.  For Gitea specifically, we only need to set a few
settings for the *gitea* user, leaving the remaining settings alone.

This commit does not include any migration to undo the settings that
were originally set,  but that should be as simple as `mv
/etc/ssh/sshd_config.rpmnew /etc/ssh/sshd_config && systemctl reload
sshd`.

roles/gitea/handlers/main.yml

@@ -9,3 +9,7 @@
   service:
     name=gitea
     state=restarted
+- name: reload sshd
+  service:
+    name: sshd
+    state: reloaded