chore(showcase): Updates according to the validator (#20478)
chore(showcase): Updates according to the validator (#20478)

- Artivest: Moved over off Gatsby to Wordpress
- Moteefe: Changed to HTTPS
- Ema Suriano's Portfolio: Removed source_url as it is no longer available
- kepinski.me: Site migrated over to Next. Removing.
- Kenneth Kwakye-Gyamfi Portfolio Site: Removed source_url as they renamed their github username and it seems the project is now private.
- React Resume Generator: the main_url was pointing to the github repo which is incorrect.
- GatsbyFinds: Removed source_url as bvlktech has deleted their GitHub account it seems.
gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby