Invite members (#161)

* Allow user invitations

* Restyle inviting members

* Remove annoying comment

* Add page for accepting an invitation

* Send invitation email with Brevo

* Prevent admins from removing personal project users

* Mark access ceontrol for cancelProjectInvitation

* Make RadioGroup controlled

* Shorten form helper text

* Use nodemailer to send emails

* Update .env.example

app/src/server/emails/sendProjectInvitation.ts

@@ -0,0 +1,29 @@
+import { env } from "~/env.mjs";
+import { sendEmail } from "./sendEmail";
+
+export const sendProjectInvitation = async ({
+  invitationToken,
+  recipientEmail,
+  invitationSenderName,
+  invitationSenderEmail,
+  projectName,
+}: {
+  invitationToken: string;
+  recipientEmail: string;
+  invitationSenderName: string;
+  invitationSenderEmail: string;
+  projectName: string;
+}) => {
+  const invitationLink = `${env.NEXT_PUBLIC_HOST}/invitations/${invitationToken}`;
+
+  const emailBody = `
+    <p>You have been invited to join ${projectName} by ${invitationSenderName} (${invitationSenderEmail}).</p>
+    <p>Click <a href="${invitationLink}">here</a> to accept the invitation.</p>
+    `;
+
+  await sendEmail({
+    to: recipientEmail,
+    subject: "You've been invited to join a project",
+    body: emailBody,
+  });
+};