FOSS4G 2025 Workshop todo

[nf-s]

Update info in https://github.com/TerriaJS/workshops/blob/main/foss4g-auckland-2025/catalogs-and-datasets.md

• Michael: Add NZ basemaps to guide
• Nick: Replace TAS data with NZ data
• Nick: Replace cesium ion token
• Nick: Add details to host data in wwwroot
• Nick: fix data examples
• Zoran: Add glTF of skytower
• Zoran: Add cesium ion tutorial
• Zoran: Fix 3d-tiles URL example

Update info in https://github.com/TerriaJS/workshops/blob/main/foss4g-auckland-2025/theming-json-based.md

• Nick: check JSON theme object

Other changes

• Use Terriajs branch with 3dtiles fix
• Setup GitHub pages - if people can't install nodejs... we need a terriamap that has #clean