Switch Ghost Database from SQLite3 to MySQL8

Official announcement: MySQL 8 will be the required database in the next major release of Ghost. I’m kinda lazy, and there are not too many viewers on my site, so I'm just using the default SQLite3 database. Now it’s time to take action.

This is a companion discussion topic for the original entry at https://henrywithu.com/switch-ghost-database-from-sqlite3-to-mysql8/