emails: Standardize branding with template inheritance and polish content #11482
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This pull request introduces a template inheritance system for email templates to ensure consistent branding across all email communications. The changes implement a base template that includes a standardized footer with "The crates.io Team" signature, and all email templates now extend this base template. Additionally, the email content has been polished for better readability and consistency, including improved phrasing in trusted publishing notifications and clearer formatting in welcome emails.