Bookstack added

Docker/bookstack/.env

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+# Password for bookstack MySQL user
+DB_PASS=<your_strong_pass>
+
+# Password for root MySQL user
+DB_ROOT_PASS=<your_strongest_pass>
+
+# Directory, where the bookstack itself will store the files
+CONFIG_PATH=/path/to/bookstack/config
+
+# Directory, where MySQL data will be stored
+DB_DATA=/path/to/db/data
+
+# Your timezone
+TZ=Europe/Warsaw
+
+# The IP:port or URL your application will be accessed on (ie. http://192.168.1.1:6875 or https://bookstack.mydomain.com
+APP_URL=https://bookstack.example.com