[FEATURE REQUEST] extend the test app `test/data/app/view/index.php`

#### What are you trying to achieve?

At the moment, many forms for unit tests with HTML elements have been implemented.

But they are all separated.
It is necessary to place links to it on the main page of the `test app` `test/data/app/view/index.php`.

#### Final goal:

Host this page with the capabilities of the conceptsjs site to provide a sandbox for those who train, research, or learn automation through the Codeceptjs framework. Same like https://the-internet.herokuapp.com