dovecot: migrated config to 2.4 + config splitting

data/conf/dovecot/dovecot.folders.conf

@@ -1,9 +1,14 @@
 namespace inbox {
   inbox = yes
   separator = /
+  mailbox storage/* {
+    quota_storage_extra = 100M
+  }
   mailbox "Trash" {
     auto = subscribe
     special_use = \Trash
+    quota_storage_percentage = 100
+    fts_autoindex = no
   }
   mailbox "Deleted Messages" {
     special_use = \Trash
@@ -194,6 +199,7 @@ namespace inbox {
   mailbox "Junk" {
     auto = subscribe
     special_use = \Junk
+    fts_autoindex = no
   }
   mailbox "Junk-E-Mail" {
     special_use = \Junk