CanIStreamIt: A few visual updates.

- Rename "Viewing Options" to "Streaming Options"
- Convert the streaming options into links.
- Remove custom style for .zci__header.

@MariagraziaAlastra Since it depends on some internal changes, it wouldn't look right on DuckPAN. Here it is on a server: https://ddh6.duckduckgo.com/?q=can+i+stream+pirates+of+caribbean