Update the README with details on new features and add them to the demo

[gak]

New features needed to be documented. Maybe a separate page in the Wiki?

• Ability to show Java exceptions (javaException) and link it to your repository.
• View in context feature (contextFilters) where you can add a term to the query while maintaining focus on a single log entry.
• Transforms: mapValue, mapClass, uppercase, shortenJavaFqcn, randomStableColor
• Copy link

Also add these examples to the docker-compose demo.

[gak]

Don't forget to update screenshots with animation this time.