feat: catch emails sent locally using Mailhog

[Jonathan1599]

What does this PR do?

Enables devs to catch emails using Mailhog. Code changes:

• Created a docker-compose.yml file in packages/emails for Mailhog.
• Created a script (yarn dx) in packages/emails/package.json to bring up Mailhog.
• Updated .env.example to work with Mailhog.
• Included step to install Mailhog manually in README.MD .

Fixes #8199

Environment: Staging(main branch) / Production

Type of change

• New feature (non-breaking change which adds functionality)

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📦 Next.js Bundle Analysis for @calcom/web

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This PR introduced no changes to the JavaScript bundle! 🙌

[PeerRich]

waiting for @keithwillcode to approve and merge. LGTM on my end