gitconfig: Update email address

.gitconfig

@@ -1,6 +1,6 @@
 # -*- mode:conf -*-
 [user]
-email = ambrevar@gmail.com
+email = mail@ambrevar.xyz
 name = Pierre Neidhardt
 
 [color]
@@ -38,14 +38,12 @@ tool = ediff
 
 [sendemail]
 smtpencryption = tls
-smtpserver = smtp.gmail.com
-smtpuser = ambrevar@gmail.com
+smtpserver = mail.gandi.net
+smtpuser = mail@ambrevar.xyz
 smtpserverport = 587
 # to = guix-patches@gnu.org
 suppresscc = author
 # sendemail.confirm = auto
-# aliasfiletype = mutt
-# aliasesfile = ~/.mutt.d/aliases
 
 [core]
 pager = cat