Add helper for Curlybars to allow filtering by user roles.

Add helper for Curlybars to allow filtering by user roles:

Feature Request Summary: 

Zendesk Guide does not provide a way to render html content based on a user's role via template pages. Zendesk should create a Curlybars helper so that Guide users can filter content in Guide theme files based on a user's role.

Description/Use Cases: 

At present, the only method for hiding content based on a user's role is via a JS script. The script works by adding a CSS property "display:none" depending on the user's role. The HTML is still rendered and visible if someone were to use the Chrome inspector to change the CSS value. There is also a possibility search engines can read the hidden content.

For security and best practice, the content should only be rendered if the user's role has permission to view the content. The HTML should not be rendered as the page builds.

Business impact of limitation or missing feature:

There is a security risk for information/data that is meant to be hidden on a Zendesk Guide Help Centre page. Given the know-how, the hidden data can be viewed.

Having this ability to render content based on a user's role will also help Zendesk Guide users build more features for support agent's and utilise the Help Centre for more than just a knowledge base.

Goal

My goal is to use the Zendesk Guide Help Centre to provide useful information for our support teams that at times, contain information I don't want rendered to end-users or visible via the inspector and search engines.

Example in home_page.hbs

<section class="section knowledge-base">
{{#if isEnduser === `end-user`}}
<!-- Nothing rendered because the user is an end-user-->
{{else}}
<!-- The following HTML is rendered because the user is an admin or agent-->
{{/if}}
</section>

Other necessary information or resources:

https://developer.zendesk.com/documentation/help_center/help-center-templates/helpers/