mixed additions

raspiblitz-custom-install-scripts/README.md

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+Raspiblitz custom installs
+
+* default:
+```
+cat /mnt/hdd/app-data/custom-installs.sh
+```
+```
+#!/bin/bash
+
+# This script runs with sudo rights after an update/recovery from a fresh sd card.
+# This is the place to put all the install commands, cronjobs or editing of system configs
+# for your personal modifications of RaspiBlitz
+
+# note: use absolute paths if you point to specific files
+
+echo "There are no custom user installs so far."
+```

raspiblitz-custom-install-scripts/custom-installs.sh

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+#!/bin/bash
+
+./tailscale.sh

raspiblitz-custom-install-scripts/tailscale.sh

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+#!/bin/bash
+
+echo "# Install Tailscale"
+mv  /var/lib/tailscale /var/lib/tailscale.backup
+curl -fsSL https://tailscale.com/install.sh | sh
+systemctl stop tailscaled
+rm -rf /var/lib/tailscale
+cp -r /mnt/hdd/app-data/tailscale /var/lib
+systemctl start tailscaled
+echo "# Tailscale install done"