nix: Make nix the root

Which means now I'll have to think about real prefixes in commit names.

unprocessed/config/autorandr/bg

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+# https://i.imgur.com/yVtVucs.jpg # Doctor Who Series 11
+# Derivate of these ones https://wallpapers.wallhaven.cc/wallpapers/full/wallhaven-230622.png
+# https://geoffrey.frogeye.fr/files/backgrounds/VertBleu.png
+https://geoffrey.frogeye.fr/files/backgrounds/BleuVert.png

unprocessed/config/autorandr/postswitch

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+#!/usr/bin/env bash
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null && pwd )"
+# From https://stackoverflow.com/a/246128
+
+# Relaunch the bars
+# i3-msg exec ~/.config/polybar/launch.sh
+# TODO Make something better with that
+i3-msg exec ~/.config/lemonbar/launch.sh
+
+# Resize background
+BGDIR="$HOME/.cache/background"
+mkdir -p "$BGDIR"
+
+list="$DIR/bg"
+url="$(cat "$list" | sed -e 's/#.*$//' -e 's/ \+$//' -e '/^$/d' | sort -R | head -1)"
+
+hash="$(printf "$url" | md5sum | cut -f1 -d' ')"
+filepath="$BGDIR/$hash"
+
+if [ ! -e "$filepath" ]; then
+    wget -c "$url" -O "$filepath"
+fi
+
+feh --no-fehbg --bg-fill "$filepath"
+
+# Make i3 distribute the workspaces on all screens
+monitors_json="$(xrandr --listmonitors | tail -n+2 | awk '{ print $4 }' | sed 's|.\+|"\0"|' | tr '\n' ',')"
+automatrop -e '{"x11_screens":['"$monitors_json"']}' --tags i3
+
+# TODO Make sure it goes from left to right
+# Either with the "main" display or using the geometry data