mysql_secure_installation: add page (#13710)

Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>
Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>

pages/common/mysql_secure_installation.md

@@ -0,0 +1,16 @@
+# mysql_secure_installation
+
+> Set up MySQL to have better security.
+> More information: <https://dev.mysql.com/doc/refman/en/mysql-secure-installation.html>.
+
+- Start an interactive setup:
+
+`mysql_secure_installation`
+
+- Use specific host and port:
+
+`mysql_secure_installation --host={{host}} --port={{port}}`
+
+- Display help:
+
+`mysql_secure_installation --help`