Revert "Add help url for remote display."

This reverts commit 2408d65c085aafdf0903d9ae6a92a9b3da5212c8.
Revert "Finalize assets for screen cast."

This reverts commit 1c6a0a7cd5a8ae0c7abf88702d0b2c90dadcbbc7.
Revert "Integrate remote display routes into screen cast settings UI."

This reverts commit 6ee077c4d87c646465aab491f2b4803e01b52d42.