feat(mailerlite): add mailerlite integration

packages/docs/pages/apps/mailerlite/connection.md

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+# MailerLite
+
+:::info
+This page explains the steps you need to follow to set up the MailerLite
+connection in Automatisch. If any of the steps are outdated, please let us know!
+:::
+
+1. Login to your MailerLite account: [https://www.mailerlite.com/](https://www.mailerlite.com/).
+2. Click on the **Integrations** tab on the left.
+3. Click on the **Use** button in the MailerLite API section.
+4. Click on the **Generate new token** button.
+5. Fill the form and click on the **Create token** button.
+6. Copy the token from the popup to the `API Key` field on Automatisch.
+7. Write any screen name to be displayed in Automatisch.
+8. Now, you can start using the MailerLite connection with Automatisch.