Remove adguard and DoH

- adguard needs manual setup and the install UI is exposed by default
- I would like to test DoH first, I suspect it's interfering with NTP
  during boot (sysntpd needs to be restarted manually to work, strace
  found that it can't resolve if started from init)

.buildbot/openwrt/build.sh

@@ -62,7 +62,6 @@ PACKAGES="kmod-nf-nathelper-extra kmod-rtc-ds1307 \
 	  alsa-lib pciutils usbutils \
 	  kmod-usb-net-qmi-wwan libqmi qmi-utils uqmi luci-proto-qmi \
 	  shadow-usermod \
-	  adguardhome \
 	  asterisk \
 	  asterisk-app-sms asterisk-pjsip asterisk-bridge-simple \
 	  asterisk-codec-alaw asterisk-codec-ulaw \
@@ -87,7 +86,7 @@ PACKAGES="kmod-nf-nathelper-extra kmod-rtc-ds1307 \
 	  collectd-mod-users collectd-mod-vmem \
 	  collectd-mod-wireless \
 	  curl etherwake fail2ban \
-	  luci-app-https-dns-proxy luci-app-mwan3 luci-app-upnp \
+	  luci-app-mwan3 luci-app-upnp \
 	  luci-ssl-nginx luci-app-acme \
 	  python3-packages python3-yaml \
 	  wireguard-tools wget-ssl \