Use Razor Layouts in FluentEmail to reuse Headers and Footers

Razor Layouts are being used to reuse the headers and footers in email templates, making it easier to maintain consistency in project communications. By creating a single layout file (_DefaultEmailLayout.cshtml) that contains the common HTML code for the header and footer, and then referencing this layout from individual email templates (FirstTemplate.cshtml and SecondTemplate.cshtml), developers can simplify their email template management process. This approach helps reduce code duplication and makes it easier to adjust the design of all emails from a single location. The use of Razor Layouts in FluentEmail also enables integration with SendGrid, allowing for dynamic email templates and improved deliverability.