mutt: Update neomutt configuration

Changed some colors, some keymaps and made it more flexible for new mail
account setups. Also removed most of the static gmail-related account
stuff since I don't need this in my public repo.

office/.config/msmtp/config

@@ -2,17 +2,17 @@
 defaults
 auth           on
 tls            on
+# disable starttls to use whole connection through ssl
+tls_starttls   off 
 tls_trust_file /etc/ssl/certs/ca-certificates.crt
 # logfile        ~/.msmtp.log
 
 # Gmail
 account        personal-gmail
+tls_starttls   on
 host           smtp.gmail.com
 port           587
 from           marty.oehme@gmail.com
-user           marty.oehme@gmail.com
-# password       plain-text-password-goes-here
 passwordeval  "pass show misc/gmail-app-password | head -n1"
 
 # Set a default account
-account default : personal-gmail