docs: provide uninstall guidance (#1938)

docs/admin-manual/uninstall.md

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+---
+title: Uninstall
+sidebar_position: 91
+---
+
+This guide provide some guidance to uninstall LibreTime from your system.
+
+We recommend using **disposable devices** for your installations, so you can delete your old system and install on a fresh one easily without worrying about old files.
+
+If you do not have a way use disposable devices, below are commands that should help you remove most of the LibreTime files from your system.
+
+:::warning
+
+Use these commands at your **own risk**, we cannot guarantee that these commands are always up to date!
+
+:::
+
+Remove configuration directories:
+
+```bash
+sudo rm -Rf /etc/airtime
+sudo rm -Rf /etc/libretime
+```
+
+Remove logs directories:
+
+```bash
+sudo rm -Rf /var/log/airtime
+sudo rm -Rf /var/log/libretime
+```
+
+Remove runtime directories:
+
+```bash
+sudo rm -Rf /var/lib/airtime
+sudo rm -Rf /var/lib/libretime
+```
+
+Remove shared directories:
+
+```bash
+sudo rm -Rf /usr/share/airtime
+sudo rm -Rf /usr/share/libretime
+```
+
+Remove systemd services files:
+
+```bash
+sudo rm -f /etc/systemd/system/airtime*
+sudo rm -f /etc/systemd/system/libretime*
+```
+
+Remove apache2 configuration files:
+
+```bash
+sudo rm -f /etc/apache2/sites-{available,enabled}/airtime*
+sudo rm -f /etc/apache2/sites-{available,enabled}/libretime*
+```
+
+Remove php configuration files:
+
+```bash
+sudo rm -f /etc/php/*/apache2/conf.d/airtime*
+sudo rm -f /etc/php/*/apache2/conf.d/libretime*
+```
+
+Remove logrotate configuration files:
+
+```bash
+sudo rm -f /etc/logrotate.d/airtime*
+sudo rm -f /etc/logrotate.d/libretime*
+```
+
+Remove python packages:
+
+```bash
+sudo pip3 uninstall \
+    libretime-analyzer \
+    libretime-api \
+    libretime-api-client \
+    libretime-playout \
+    libretime-shared \
+    libretime-celery
+
+# Check if we forgot old python packages.
+# Remove packages that show up with this commands.
+sudo pip3 freeze | grep libretime
+sudo pip3 freeze | grep airtime
+```
+
+Delete the postgresql database and user:
+
+```bash
+sudo -u postgres dropdb airtime
+sudo -u postgres dropdb libretime
+
+sudo -u postgres dropuser airtime
+sudo -u postgres dropuser libretime
+```
+
+Delete the rabbitmq vhost and user:
+
+```bash
+sudo rabbitmqctl delete_vhost airtime
+sudo rabbitmqctl delete_vhost libretime
+
+sudo rabbitmqctl delete_user airtime
+sudo rabbitmqctl delete_user libretime
+```
+
+Delete the file storage (you probably don't want that):
+
+```bash
+sudo rm -Rf /srv/airtime
+sudo rm -Rf /srv/libretime
+```
+
+Search for remaining files:
+
+```bash
+sudo find / -name "libretime*"
+sudo find / -name "airtime*"
+```