Add AST Explorer to the Docs Site

[A1shK]

Is your feature request related to a problem? Please describe.

Describe the solution you'd like

When working on BeforeResolve transforms, it becomes extremely important to understand the AST node structure. Having an AST Explorer makes it easier to understand what needs to be done in a BeforeResolve transform.

The AST Explorer should show the AST that is generated from a given content.