Add EarningsCall to the site list.

[ghost]

Description

Add EarningsCall to the list of sites that use react-static.

Changes/Tasks

• Changed code

Motivation and Context

Screenshots (if appropriate):

Types of changes

• Refactoring/add tests (refactoring or adding test which isn't a fix or add a feature)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I have updated the documentation accordingly
• I have updated the CHANGELOG with a summary of my changes
• My changes have tests around them