Refactor video template

[pauljickling]

The video template is a complicated mechanism for generating multiple video pages. There are a lot of variables, UI components, and moving pieces. It is currently a bit difficult to make changes because it can be difficult to keep everything in your head. So this calls out for some refactoring work.

Solution:

• Make sure all variables that are logically connected are grouped together
• Remove any potentially unnecessary variables
• Rename any variables with unclear names
• Create separate, smaller UI components where it makes sense (the pagination UI is a strong candidate for this, especially since it appears more than once on a page)