Housekeeping

- Update README
- Run shellcheck on .sh files
- Add helper scripts
- Remove eirene vm variant
- Add post-install checklist

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/eirene/scripts/card.sh

@@ -0,0 +1,10 @@
+AMD=/dev/dri/by-path/pci-0000:06:00.0-card
+NVIDIA=/dev/dri/by-path/pci-0000:01:00.0-card
+
+if [[ -e "${AMD}" ]]; then
+  CARD=${AMD}
+else
+  CARD=${NVIDIA}
+fi
+
+ln -sf "${CARD}" "${HOME}"/.config/hypr/card