Updated blank state for environments and deployments

## What does this MR do?

Adds a designed blank state to environments and deployments.

@markpundsack do we want to hide the new environments when empty? Looks weird otherwise with the green button at the top.

## What are the relevant issue numbers?

Closes #18661 

## Screenshots (if relevant)

![Screen_Shot_2016-06-21_at_09.55.03](/uploads/cf768aba3fd85a596d24b7be4fe6a6c0/Screen_Shot_2016-06-21_at_09.55.03.png)

![Screen_Shot_2016-06-21_at_09.55.10](/uploads/b7b7dba90b613cfa867b084661b36b06/Screen_Shot_2016-06-21_at_09.55.10.png)

See merge request !4818