Include "How to Create a Linux Terminal in CoCalc" Video on Features Page

[Blaec-CoCalc]

Is your feature request related to a problem? Please describe.
I believe the current Features Page of CoCalc lacks direct instructional content that can enhance user understanding of the platform. Including the video "How to Create a Linux Terminal in CoCalc" would significantly improve user comprehension and engagement.

Describe the solution you'd like
Add the video link "https://youtu.be/4UK1hJorpEc" to the Features Page "https://cocalc.com/features/terminal" at the top section. Additionally, remove or relocate the current graphic at the top of the page to make space for the video.

Describe alternatives you've considered
Considered keeping the graphic while adding the video below it, but this may clutter the page. The suggestion is to either replace or relocate the graphic to enhance clarity.

Additional context
This change aims to improve SEO and better communicate the functionalities and conveniences provided by CoCalc, ultimately attracting more users and retaining interest.