Layout improvements for Learning Mode "Large Video" template.

[aaronfc]

This is how the Large Video template for Learning Mode looks like when the content is long enough.

Context / Source

• Reported initially by Gonzalo.
• Issues identified:
  • Course outline must be aligned to the top. Next to "Contratar dominio y hosting" title.
  • We must add the option to make the Course outline sticky like in the Modern template.
  • We must ensure that the content extends to the full width (like the notice does in the screenshot). This might have to do with how Divi works, but we must ensure that the content can meet the full width defined.