This page jumps ahead without explaining the concepts, despite being named "Overview"

### Page URL

https://docs.flutter.dev/ui/navigation/

### Page source

https://github.com/flutter/website/tree/main/src/content/ui/navigation/index.md

### Describe the problem

What is a route? What is deep-linking? What is a `Page`? Compared to most of the docs I've read so far, this page assumes a lot of prior knowledge and doesn't provide thorough, full examples.

### Expected fix

Some broader explanation of the concepts and some more fleshed out examples would be really helpful.

### Additional context

_No response_

### I would like to fix this problem.

- [ ] I will try and fix this problem on docs.flutter.dev.