Adding new themes to Gradio 5.0 (#9437)
* Adding citrus, colorful and headlines themes
* add changeset
* Fix from running format_backend
* Add new themes to theming guide
* Rename headlines theme demo file
* changes
* add changeset
* changes
* changes
* fix name
* revert kitchen sink
* ocean and docs
* changes
* add changeset
* changes
* changes
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Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>
Co-authored-by: Abubakar Abid <abubakar@huggingface.co>
Co-authored-by: Ali Abid <aliabid94@gmail.com>
