Fix PATH issue on Steam Deck by adding symbolic links

- Create symlinks in /usr/local/bin for immediate global access
- Ensure /usr/local/bin directory exists with mkdir -p
- Set proper executable permissions on binaries
- Keep profile.d approach as fallback and source for current session
- Update uninstall script to remove specific files and clean up symlinks
- Use rm -rf for systemd override directory cleanup

Fixes #38

uninstall.sh

@@ -1,6 +1,13 @@
 systemctl stop tailscaled
 systemctl disable tailscaled
-rm /etc/systemd/system/tailscaled.service
-rm /etc/default/tailscaled
-rm /etc/profile.d/tailscale.sh
-rm -rf /opt/tailscale/tailscale
+rm -f /etc/systemd/system/tailscaled.service
+rm -rf /etc/systemd/system/tailscaled.service.d
+rm -f /etc/default/tailscaled
+rm -f /etc/profile.d/tailscale.sh
+rm -f /usr/local/bin/tailscale
+rm -f /usr/local/bin/tailscaled
+# Remove specific Tailscale binaries
+rm -f /opt/tailscale/tailscale
+rm -f /opt/tailscale/tailscaled
+# Remove the directory if it's empty (will fail silently if it contains other files)
+rmdir /opt/tailscale 2>/dev/null || true