[Docs] Polish docs for bottom-up approach #735
Description
Story
As a LoopBack4 user, I would like an easy to follow and intuitive tutorial which shows me how to make a LB4 app using TypeScript model definitions, decorators, and API spec fragments.
We already have a tutorial repository in https://github.com/strongloop/loopback4-example-getting-started, now we need to expose it in our docs on loopback.io.
See also #729
Acceptance Criteria
- Rename http://loopback.io/doc/en/lb4/Defining-and-validating-the-API.html to something like "Define your API top-down way"
- Add a new page at the same level, something like "Define your API bottom-up way". Explain basic concepts (controller decorators like
@post,@parametc.) and point people to example-getting-started as the tutorial. - Add a note to both top-down and bottom-up pages pointing readers to each other, mentioning that both approaches are valid and fully supported by LoopBack.
- In http://loopback.io/doc/en/lb4/Examples-and-tutorials.html, update the description for example-getting-started to make it clear the example is showing bottom-up approach.