Move preparation to database-setup.

docs/wiki/database-setup/Setup-MySQL-or-MariaDB.md

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+# Setup MySQL database for PowerDNS-Admin
+
+This guide will show you how to prepare a MySQL or MariaDB database for PowerDNS-Admin.
+
+### Step-by-step instructions
+1. ivan@ubuntu:~$ `mysql -u root -p` (then enter your MySQL/MariaDB root users password)
+2. mysql> `CREATE DATABASE powerdnsadmin CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;`
+3. mysql> `GRANT ALL PRIVILEGES ON powerdnsadmin.* TO 'pdnsadminuser'@'%' IDENTIFIED BY 'p4ssw0rd';`
+4. mysql> `FLUSH PRIVILEGES;`
+5. mysql> `quit`
+
+**NOTE:**
+
+If you plan to manage large zones, you may encounter some issues while applying changes.
+This is due to PowerDNS-Admin trying to insert the entire modified zone into the column history.detail.
+
+Using MySQL/MariaDB, this column is created by default as TEXT and thus limited to 65,535 characters.
+
+_Solution_:
+
+Convert the column to MEDIUMTEXT: 
+
+* `USE powerdnsadmin;`
+* `ALTER TABLE history MODIFY detail MEDIUMTEXT;`