(#381) Remove Add to Calendar buttons in flyout

[st3phhays]

Description Of Changes

This removes the "Add to Calendar" buttons in the left side flyout and
instead only shows a "Learn More" button.

Motivation and Context

This was causing too much work to maintain.

Testing

1. Run the website.
2. Open the flyout.
3. The "Unpacking Software" and "Product Spotlight" events no longer have "Add to Calendar" buttons.
4. On chocolatey.org, all "Add to Calendar" buttons on the home page and event page still function normally.

Change Types Made

• Bug fix (non-breaking change).
• Feature / Enhancement (non-breaking change).
• Breaking change (fix or feature that could cause existing functionality to change).
• Documentation changes.
• PowerShell code changes.

Change Checklist

• Requires a change to the documentation.
• Documentation has been updated.
• Tests to cover my changes, have been added.
• All new and existing tests passed?
• PowerShell code changes: PowerShell v2 compatibility checked?

Related Issue

• https://github.com/chocolatey/chocolatey.org/issues/304
• Remove Add to Calendar buttons in flyout #381
• Remove Add to Calendar buttons in flyout home#298
• https://gitlab.com/chocolatey/community-infrastructure/community.chocolatey.org/-/issues/1246

[AdmiringWorm]

LGTM