Retire Docker-based tools to unused/

Docker is not installed on pet630, so neither of these can run there:

- docker-idrac.sh is the container-based alternative to the ipmi-fancontrol
  scripts, which remain in service.
- webnut-docker/ is the web UI for the NUT daemon. NUT itself is still
  running on the host; only this front end is retired.

The gitignored .env moves with the compose file and is still excluded at the
new path.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

unused/docker-idrac.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+docker run -d \
+  --name Dell_iDRAC_fan_controller \
+  --restart=unless-stopped \
+  -e IDRAC_HOST=local \
+  -e FAN_SPEED=24 \
+  -e CPU_TEMPERATURE_THRESHOLD=70 \
+  -e CHECK_INTERVAL=60 \
+  -e DISABLE_THIRD_PARTY_PCIE_CARD_DELL_DEFAULT_COOLING_RESPONSE=true \
+  --device=/dev/ipmi0:/dev/ipmi0:rw \
+  tigerblue77/dell_idrac_fan_controller:latest