Design email for multiple grant contributions

### User Story

When I support many grants, I want a short and concise email on everything I've donated to.

### Why Is this Needed

Current email is just combining many grants with repetitive Thank you messages. Image and font sizes are very large.

### Description

Reformat body of email.

### Current Behavior
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### Expected Behavior
[comment]: # (Describe what you expected to happen.)

### Definition of Done
Reformat email

### Data Requirements
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### Additional Information
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