Archive PloneConf 2023, prepare for PloneConf 2024

[stevepiercy]

The following tasks need to be performed to archive the trainings from PloneConf 2023 and prepare for PloneConf 2024.

See also https://github.com/plone/training/issues/672

• [ ] Determine which trainings will and will not be presented in 2024
• [x] Configure DNS for 2023.training.plone.org
• [x] Configure web server for 2023.training.plone.org
• [ ] Update Matomo to track new hostname
• [x] Cut branch 2023 from main
• [x] Ensure 2023 branch deploys to 2023.training.plone.org
• [ ] Update the home page to mention the 2023 archive

List of trainings to keep or add for PloneConf 2024

• Mastering Plone 6 development
• Mastering Plone 5 development
• Volto Hands-On
• Volto Add-ons Development
• Volto Customization for JavaScript Beginners
• Effective Volto
• Testing Plone
• Plone 6 Classic UI Theming
• Plone Deployment
• Plone Workflow
• Migration best practices