nix: Make nix the root

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

unprocessed/config/scripts/diapo

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+
+# Don't forget:
+# --duration 15m # Specify expected duration of presentation
+# --half-screen --geometry 2048x768+0+1 # If presenting with beamer notes on the right, and you have two screens with 1024x768 resolution
+
+
+/home/geoffrey/Documents/Programmation/Impressive/OutOfTree/impressive.py \
+    --transition WipeRight \
+    --bind lmb:=box-zoom --bind lmb=zoom-exit \
+    --bind rmb:=box-add --bind rmb=box-clear \
+    --bind ctrl+p:=overview-enter --bind ctrl+a:=overview-confirm \
+    --bind escape:=time-reset \
+    --bind e:=goto-last \
+    --bind b-=fade-to-black \
+    --bind escape-=quit \
+    --cursor default \
+    --fontsize 26 \
+    --transtime 200 \
+    --mousedelay 1000 \
+    --page-progress \
+    --time-display \
+    --tracking \
+    --zoomdarkness 75 \
+    "$@"