Update documentation.

README.upgrade

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+
+# ====================
+# - Upgrading CryptPad
+# ====================
+
+# see: https://docs.cryptpad.org/en/admin_guide/maintenance.html#upgrading-cryptpad
+
+# - Note!
+# -
+# - Always read the release notes before upgrading, as there may be changes
+# - that require special consideration.
+
+
+cryptpad_user=cryptpad
+
+
+# - Stop cryptpad
+# -
+systemctl stop cryptpad
+
+
+# Stop iptables firewall
+#
+ipt-firewall-server flush
+ip6t-firewall-server
+
+
+# Login as CryptPad user
+#
+su - ${cryptpad_user}
+
+
+# - Backup existing installation
+# -
+cp -a cryptpad cryptpad.BAK.$(date +%Y-%m-%d-%H%M)
+
+
+# - Change into installation directory
+# -
+cd cryptpad
+
+# - Update Git repository
+# -
+git pull
+npm update
+npm run install:components
+
+
+exit
+
+
+# Restart firewll
+#
+ipt-firewall-server
+ip6t-firewall-server
+
+
+# - Start cryptpad
+# -
+systemctl start cryptpad
+