Internal: Remove Send promotion [TMZ-1017]

[hein-obox]

✨ PR Description

Purpose: Remove deprecated Send plugin promotion from Hello Theme admin dashboard to clean up outdated marketing content and simplify plugin promotion logic.

Main changes:

• Removed conditional block checking for SEND_VERSION constant and entire Send plugin promotional card configuration
• Simplified control flow by converting elseif to direct if statement for Elementor AI promotion
• Eliminated Send-specific promotional assets including logo, messaging, and install button configuration

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