Add nag for syncthing conflicts

dotfiles/bmo/nag.ini

 [nag.stream]
     master = event overdue projsum active week
+    master = event overdue projsum active week stconflict
 
 [nag.def.event]
     command = task rc.verbose=nothing list +event due.before:now+2w -ACTIVE
     expiry = 6 hours
     term-color = lgreen
 
+[nag.def.stconflict]
+    command = find $HOME/st/config/dotfiles* -name "*conflict*" | grep -v st/config/dotfiles/weechat
+    expiry = 3 hours
+    notify-urgency = critical
+    term-color = lred
+
 [nag.def.week]
     command = task rc.verbose=nothing list +WEEK -ACTIVE
     expiry = 2 hours