🚀 Feature: Add email share link to blog posts

[JoshuaKGoldberg]

Bug Report Checklist

• [X] I have tried restarting my IDE and the issue persists.
• [X] I have pulled the latest main branch of the repository.
• [X] I have searched for related issues and found none that matched my issue.

Overview

Blogs have LinkedIn and Twitter share links right now. I'll add in an email one too.

Additional Info

No response