Add contact, upgrade versions, add docs

src/email/email.service.ts

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+import { Injectable } from '@nestjs/common';
+import Mailgun from 'mailgun.js';
+import * as formdata from 'form-data';
+import { IMailgunClient } from 'mailgun.js/Interfaces';
+import { ConfigService } from '@nestjs/config';
+
+@Injectable()
+export class EmailService {
+  private readonly mailgun: IMailgunClient | undefined;
+  private static readonly emailFromDomain = 'hello.hooli.co';
+
+  constructor(private readonly configService: ConfigService) {
+    const mailgun = new Mailgun(formdata);
+    const hooliKey = this.configService.get<string>('mailgun.hooliKey');
+    if (!hooliKey) {
+      return;
+    }
+    this.mailgun = mailgun.client({
+      username: 'api',
+      key: hooliKey,
+    });
+  }
+
+  async sendEmail(to: string[], subject: string, text: string) {
+    if (!this.mailgun) {
+      return;
+    }
+    return this.mailgun.messages.create(EmailService.emailFromDomain, {
+      from: `HooliMail <hooli-mail@${EmailService.emailFromDomain}>`,
+      to,
+      subject,
+      text,
+      html: text,
+    });
+  }
+}