Remove support for quota_set / SETQUOTA

data/settings.js

@@ -2690,14 +2690,6 @@ quota backend. It means you can have the quota in Maildir++ format (e.g.
 \`10000000S\`).`
 	},
 
-	quota_set: {
-		plugin: 'quota',
-		values: setting_types.STRING,
-		seealso: [ '[[link,quota_admin]]' ],
-		text: `
-A dictionary string where your quota limit exists and can be modified.`
-	},
-
 	quota_warning: {
 		plugin: 'quota',
 		values: setting_types.STRING,

docs/core/plugins/imap_quota.md

@@ -15,60 +15,3 @@ It implements the IMAP commands defined in [[rfc,2087]]
 ## Settings
 
 There are no `dovecot.conf` settings for this plugin.
-
-## Quota Admin Commands
-
-This plugin implements the IMAP `SETQUOTA` command, which allows changing the
-logged in user's quota limit if the user is admin.
-
-Normally this means that a master user must log in with
-`userdb_admin = y` set in the master passdb.
-
-The changing is done via `dict_set()` command, so you must configure the
-[[setting,quota_set]] setting to point to some dictionary where your quota
-limit exists.
-
-Example, for SQL:
-
-::: code-group
-```[dovecot.conf]
-plugin {
-  quota_set = dict:proxy::sqlquota
-}
-
-dict {
-  sqlquota = mysql:/etc/dovecot/dovecot-dict-sql.conf.ext
-}
-```
-
-```[dovecot-dict-sql.conf.ext]
-# Use "host= ... pass=foo#bar" with double-quotes if your password has '#'
-# character.
-connect = host=/var/run/mysqld/mysqld.sock dbname=mails user=admin \
-  password=pass
-
-# Alternatively you can connect to localhost as well:
-#connect = host=localhost dbname=mails user=admin password=pass # port=3306
-
-map {
-  pattern = priv/quota/limit/storage
-  table = quota
-  username_field = username
-  value_field = bytes
-}
-
-map {
-  pattern = priv/quota/limit/messages
-  table = quota
-  username_field = username
-  value_field = messages
-}
-```
-:::
-
-Afterwards the quota can be changed with the IMAP command:
-
-```
-a SETQUOTA "User quota" (STORAGE 12345 MESSAGES 123)
-```
-