README: remove one-time migration section

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -104,22 +104,6 @@ All routes require a login session. On first run you are redirected to `/setup`
 
 **Changing the admin password** — click the ⚙ Settings button in the top-right corner. Enter your current password to confirm, then set a new username and/or password. You will be logged out automatically and redirected to login.
 
-## Upgrading from an older install (path migration)
-
-If you installed MicroNAS before the `/etc/micronas/` directory was introduced, run this once:
-
-```bash
-mkdir -p /etc/micronas
-[ -f /etc/micronas.env ] && mv /etc/micronas.env /etc/micronas/micronas.env
-[ -f /etc/micronas-webdav.passwd ] && mv /etc/micronas-webdav.passwd /etc/micronas/webdav.passwd
-chown root:www-data /etc/micronas/webdav.passwd
-chmod 640 /etc/micronas/webdav.passwd
-# Patch the Apache config if it still references the old path
-sed -i 's|/etc/micronas-webdav.passwd|/etc/micronas/webdav.passwd|' \
-    /etc/apache2/conf-available/micronas-webdav.conf
-cp /opt/micronas/micronas.service /etc/systemd/system/
-systemctl daemon-reload && systemctl restart micronas && systemctl reload apache2
-```
 
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