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/common/user/configs/gui/spicetify/config/merge.sh

@@ -1,19 +1,19 @@
 SOURCE_FILE=$(realpath -m "$1")
 TARGET_FILE=$(realpath -m "$2")
 
-mkdir -p "$(dirname "$TARGET_FILE")"
+mkdir -p "$(dirname "${TARGET_FILE}")"
 
 TEMP_FILE=$(mktemp)
-cat "$SOURCE_FILE" > "$TEMP_FILE"
+cat "${SOURCE_FILE}" > "${TEMP_FILE}"
 
-if [ -f "$TARGET_FILE" ]; then
+if [[ -f "${TARGET_FILE}" ]]; then
   while IFS='=' read -r key value; do
-    if ! grep -q "^${key}=" "$TEMP_FILE"; then
-      echo "${key}=${value}" >> "$TEMP_FILE"
+    if ! grep -q "^${key}=" "${TEMP_FILE}"; then
+      echo "${key}=${value}" >> "${TEMP_FILE}"
     fi
-  done < "$TARGET_FILE"
+  done < "${TARGET_FILE}"
 fi
 
-mv "$TEMP_FILE" "$TARGET_FILE"
+mv "${TEMP_FILE}" "${TARGET_FILE}"
 
-echo "Configuration file $TARGET_FILE has been updated."
+echo "Configuration file ${TARGET_FILE} has been updated."