OMI booths for gltf-extensions

[madjin]

• convert readmes to poster images
• use provided assets to convey examples
• use OMI style guide for branding

[madjin]

Lotta glTF assets we can use for booths in the github repos: https://github.com/omigroup/gltf-extensions

[madjin]

remixable booth templates: https://sketchfab.com/3d-models/remixable-booth-templates-d565cb7935744d6190b7d23b260e743b