clayui.com: Add more information to our Forms docs

[pat270]

From a private slack message:

For example, I was creating a Client Extension with REACT , that has a form.
In order to build it with Clay, I found difficult to find in the documentation things like:

• How to define a form and how to for example set the function that the form should trigger
• No clear info about how to submit the form
• No clear info about how to handle the onchange in the input fields
• Not many examples of how to compose and style the form (there is just an HTML example)

As an example, it would be great to have also the code using JS components of the examples in this page:
https://v2.clayui.com/docs/css-framework/satellites/forms/form-elements.htm

[matuzalemsteles]

I think we can use the same technical documentation that @marcoscv-work is working on, he's working on something like this.

[ethib137]

Yeah, the work Marcos is doing will tie in nicely with this. Additionally, it could be worthwhile for us to specifically consider the Objects apis when submitting a form, since that is likely the most common use case now for a customer creating a React form in Liferay inside a client extension.

[liferay-platform-experience]

LPS Ticket: https://liferay.atlassian.net/browse/LPS-190182