Remove December Banner

[Copilot]

Conference/Workshop Details

N/A - This PR does not add a conference or workshop.

Checklist

• Build runs successfully

Changes Made

Commented out the banner include statement in _layouts/default.html:

- {% include banner.html %}
+ <!-- {% include banner.html %} -->

This hides the banner site-wide while preserving the code for future re-enablement.

Additional context

The banner content (Cypress cy.prompt() promotional message) remains in _includes/banner.html but is no longer rendered on any pages.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Remove December Banner</issue_title>
<issue_description>Hide the banner by commenting out this code: {% include banner.html %}</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Remove December Banner #821

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