Add more practical examples

[zlovatt]

While some developers come into this doc knowing that it's mostly an API reference, it's a little obtuse for people trying to learn scripting.

To that end, adding more real-world examples into the docs would help make this appeal to a broader audience while still maintaining its status as the go-to API ref for AE scripting.

I could see this working in one of these ways (or any mix of):

1. A new 'examples' top-level category, broken into sub-categories with examples in each
   • "Keyframes"
     • "Adding keyframes"
     • "Setting eases"
     • "Removing keyframes [note: need to do this in reverse!]", etc
   • "Render Queue"
     • "Rendering items"
     • "Setting render templates" [because this generally sucks]
2. Adding an "Examples" page into each existing top-level category
   • "Property"
     • "Setting position values"
     • "Adding an expression"
3. Specifically seeding the entire site with more inline examples under each property/method
   • Many pages already have this, such as Layer.marker

Note that route 3 here may lead the docs to become a lot messier & harder to parse, for people looking for a clean API reference doc.