TV articles change

- Removed obsolete article about TV Emulator (new one is published already),
- Extended article with info about supported adaptive bitrate streaming and drm formats in the TV Store,
Suggested review:

Whenever you switch to the next audio/video source with JavaScript, make sure to destroy the current audio/video element, and create a new one. Without this some devices may have problems playing the new audio/video source, especially if the format is different than the one previously played.