shell-things/Windows/DoH

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# DNS over HTTPS in Windows 11

Requires Windows 11.

- `GPO-EnforceDoH.reg` enables the group policy to require DoH. However it
  didn't seem to work for me or it allowed me to set the DNS server to not use
  DoH.

- `DohWellKnownServers` adds DoH support for multiple IPv4 & IPv6 addresses
  that Windows 11 isn't shipping by default, currently:
  - Adguard
  - Cloudflare antimalware
  - Mullvad
  - Mullvad Adblock
  - Quad9 ECS (Windows 11 defaults include Quad9 default)
  - TREX (actually points to Quad9 as per
    [their documentation](https://www.trex.fi/service/resolvers.html))

## Configuration

Once Windows knows about the DoH servers (DohWellKnownServers.reg), DNS-over
HTTPS can be enabled for:

- All networks:
  `Windows-I (Settings) -> Network & Internet -> Advanced network settings -> WLAN -> View additional properties -> DNS Server assignment -> Edit`
  - Same place for Ethernet etc.
- Specific network:
  `Windows-I (Settings) -> Network & Internet -> WiFi -> Connected SSID -> DNS server assignment -> Edit`
  - Note: if the all networks one is configured, there is a warning about it
    not being used.