2023 refactoring

[patricia-ternes]

Update information from 2022 to 2023

The changes includes:

• remove unused images
• remove unused data files
• update Year
• update site base url
• update dates
• update email
• update Logo
• update header images >> to use UoL images
• update tito link
• update "About" >> Maybe need additional changes
• update teams pics & data >> Needs further update
• Add temporary/hold schedule and sessions info

[patricia-ternes]

Wait - this is in the wrong place!

[patricia-ternes]

This PR should be done in the 2023 repo. Closing here to open there.