Remove incorrect async/await from email template render functions (#53)

* Initial plan

* Remove incorrect async/await from email render functions

Co-authored-by: devakesu <61821107+devakesu@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: devakesu <61821107+devakesu@users.noreply.github.com>

Author: Copilot

src/lib/email-templates/index.ts

@@ -8,23 +8,23 @@ export { CourseMismatchEmail, AttendanceConflictEmail };
 /**
  * Render email templates to HTML strings
  */
-export const renderCourseMismatchEmail = async (props: {
+export const renderCourseMismatchEmail = (props: {
   username: string;
   date: string;
   session: string;
   manualCourseName: string;
   courseLabel: string;
   dashboardUrl: string;
-}): Promise<string> => {
-  return await render(CourseMismatchEmail(props) as React.ReactElement);
+}): string => {
+  return render(CourseMismatchEmail(props) as React.ReactElement);
 };
 
-export const renderAttendanceConflictEmail = async (props: {
+export const renderAttendanceConflictEmail = (props: {
   username: string;
   courseLabel: string;
   date: string;
   session: string;
   dashboardUrl: string;
-}): Promise<string> => {
-  return await render(AttendanceConflictEmail(props) as React.ReactElement);
+}): string => {
+  return render(AttendanceConflictEmail(props) as React.ReactElement);
 };