Update terraform files and instructions (#1402)

* Update terraform files and instructions

Update proxy terraform files based on current best practices and allow
exclusion of forwarding rules for HTTP endpoints.  Specifically:
-   Add a "public_web_whois" input to allow disabling the public HTTP
    whois forwarding.
-   Add "description" fields to all variables.
-   Move outputs of the top-level module into "outputs.tf".
-   Auto-reformat using hclfmt.

docs/proxy-setup.md

@@ -105,13 +105,14 @@ mentioned above.
 
 Navigate to `proxy/terraform`, create a folder called
 `envs`, and inside it, create a folder for the environment that proxy is
-deployed to ("alpha" for example). Copy `example_config.tf` to the environment
-folder.
+deployed to ("alpha" for example). Copy `example_config.tf` and `outputs.tf`
+to the environment folder.
 
 ```bash
 $ cd proxy/terraform
 $ mkdir -p envs/alpha
 $ cp example_config.tf envs/alpha/config.tf
+$ cp outputs.tf envs/alpha
 ```
 
 Now go to the environment folder, edit the `config.tf` file and replace