cherry-pick: 4276 upd quic port

Merge in DNS/adguard-home from 4276-doq-port to master

Closes #4276.

Squashed commit of the following:

commit cbdde62
Merge: d32c13e 2c33ab6
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Wed Mar 23 15:47:43 2022 +0300

    Merge branch 'master' into 4276-doq-port

commit d32c13e
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Mar 21 21:55:09 2022 +0300

    all: fix link

commit 0afd702
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Mar 21 21:47:38 2022 +0300

    all: imp docs, log changes

commit 9a77fc3
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Mar 21 21:41:30 2022 +0300

    home: upd quic port

internal/home/dns.go

@@ -25,7 +25,7 @@ const (
 	defaultPortDNS   = 53
 	defaultPortHTTP  = 80
 	defaultPortHTTPS = 443
-	defaultPortQUIC  = 784
+	defaultPortQUIC  = 853
 	defaultPortTLS   = 853
 )