docs: Create a new Make a RESTful API guide

[lonnieezell]

Description
This creates a new "Getting Started with RESTful APIs" guide that steps through using the auto-routing and ResponseTrait, plus the new transformers and API response pagination to create a simple API.

It moves the existing tutorial under a new "Guides" section.

[neznaika0]

Guides are a great idea. We can discuss on the forum what built-in mechanics are possible using the framework. I tried to tell you about the Validator, but you didn't approve.

I looked it up from phone.

[neznaika0]

You have moved the pages to the directory. Some error correction paths need to be updated.
../outgoing/* >> ../../outgoing/*

[michalsn]

This looks great - it's a really nice introduction to the topic and a solid guide overall.

As mentioned, there are a few issues with the links (since we reference the tutorial in several places), and some of the images appear to be broken.

The only thing I'm not happy with is the current navigation. Subpages aren't visible in the left menu when you enter a specific guide category, which makes it difficult to move between different parts of the guide. Setting 'navigation_depth': 3 in conf.py should fix this.

Other than that, everything looks very good.

[paulbalandan]

I have implemented the changes as requested. Please propose changes where necessary.

[datamweb]

Thanks!

[paulbalandan]

Thanks, everyone!