docs(maintenance): update document

maintenance.md

@@ -1,45 +1,25 @@
 # Maintenance
 
-## With caution
-
-- Remove duplicate `/gluetun` directory creation
-- Remove firewall shadowsocks input port?
-- Remove `script-security` option
-
-## Uniformization
-
-- Filter servers by protocol for all
-- Multiple IPs addresses support for all proviedrs
-- UPDATER_PERIOD only update provider in use
-
-## Code
-
+- Rename `UNBLOCK` to `DOT_UNBOUND_UNBLOCK`
+- Move constants.*RegionChoices to a validation package
+- Common filtering functions
+- Refactor providers code to have one directory per VPN provider
+- Use DNS v2 beta
+- Go 1.18
+  - gofumpt
+  - Use netip
+- Split servers.json and compress it, use Git LFS
+- DNS block lists as LFS and built in image
+- Finish HTTP server v1 or v2
 - Use `github.com/qdm12/ddns-updater/pkg/publicip`
 - Windows and Darwin development support
-- Use `internal/netlink` in firewall and routing packages
 
 ## Features
 
-- Pprof server
-- Pre-install DNSSEC files so DoT can be activated even before the tunnel is up
-- Gluetun entire logs available at control server, maybe in structured format
 - Authentication with the control server
 - Get announcement from Github file
 - Support multiple connections in custom ovpn
-
-## Gluetun pre-v4
-
-- Finish HTTP server v1 or v2
-- Renamings
-  - `UNBLOCK` to `DOT_UNBOUND_UNBLOCK`
-  - `PIA_ENCRYPTION` to `PRIVATE_INTERNET_ACCESS_OPENVPN_ENCRYPTION_PRESET`
-  - `PORT_FORWARDING` to `PRIVATE_INTERNET_ACCESS_VPN_PORT_FORWARDING`
-  - Rename PIA's `REGION` to `COUNTRY`
-  - `WIREGUARD_ADDRESS` to `WIREGUARD_ADDRESSES`
-  - `VPNSP` to `VPN_SERVICE_PROVIDER`
-  - Rename `REGION` (etc.) to `SERVER_REGIONS`
-  - `OPENVPN_CIPHER` to `OPENVPN_CIPHERS`
-- Split servers.json and compress it
+- Automate IPv6 detection for OpenVPN
 
 ## Gluetun V4
 
@@ -59,10 +39,11 @@
   - Remove `OPENVPN_CONFIG` != "" implies `VPNSP` = "custom" AND set `OPENVPN_CUSTOM_CONFIG` default to `/gluetun/custom.ovpn`
 - Remove functionalities
   - `SERVER_NUMBER`
+  - `SERVER_NAME`
   - `PUBLICIP_FILE`
   - `PORT_FORWARDING_STATUS_FILE`
 - Updater servers version reset to 1
-- Remove HTTP server v0
+- Reset HTTP server version to v1 and remove older ones
 - Change to compulsory
   - `VPN_SERVICE_PROVIDER`
 - Use relative paths everywhere instead of absolute