chore(server): clean mail-templates and add tailwind style (#11296)

With this commit I wanted to complete the react-mail
 structure by properly define the templates styles by
 including tailwind css framework.

The framework is extended by both react-mail and
 tailwindcss-preset-email. Those packages help the rendering
 for various email clients.

If in future there is the necessity to target specific mail
 clients the package `tailwindcss-email-variants` and
 `tailwindcss-mso` can help too. The latter has some
 workarounds for the Ms Outlook that is still lacking
 a lot of the CSS3 funcitonality.
 to target

Signed-off-by: hitech95 <nicveronese@gmail.com>

server/src/emails/components/button.component.tsx

@@ -0,0 +1,14 @@
+import React from 'react';
+
+import { Button, ButtonProps } from '@react-email/components';
+
+interface ImmichButtonProps extends ButtonProps {}
+
+export const ImmichButton = ({ children, ...props }: ImmichButtonProps) => (
+  <Button
+    {...props}
+    className="py-3 px-8 border bg-immich-primary rounded-full no-underline hover:no-underline text-white hover:text-gray-50 font-bold uppercase"
+  >
+    {children}
+  </Button>
+);