Adiciona arquivo .env.example com variáveis de ambiente para integraç…

…ão com serviços externos

.env.example

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+# visit https://giscus.app to get your Giscus ids
+NEXT_PUBLIC_GISCUS_REPO=
+NEXT_PUBLIC_GISCUS_REPOSITORY_ID=
+NEXT_PUBLIC_GISCUS_CATEGORY=
+NEXT_PUBLIC_GISCUS_CATEGORY_ID=
+NEXT_PUBLIC_UTTERANCES_REPO=
+NEXT_PUBLIC_DISQUS_SHORTNAME=
+
+MAILCHIMP_API_KEY=
+MAILCHIMP_API_SERVER=
+MAILCHIMP_AUDIENCE_ID=
+
+BUTTONDOWN_API_KEY=
+
+CONVERTKIT_API_KEY=
+# curl https://api.convertkit.com/v3/forms?api_key=<your_public_api_key> to get your form ID
+CONVERTKIT_FORM_ID=
+
+KLAVIYO_API_KEY=
+KLAVIYO_LIST_ID=
+
+REVUE_API_KEY=
+
+# Create EmailOctopus API key at https://emailoctopus.com/api-documentation
+EMAILOCTOPUS_API_KEY=
+# List ID can be found in the URL as a UUID after clicking a list on https://emailoctopus.com/lists
+# or the settings page of your list https://emailoctopus.com/lists/{UUID}/settings
+EMAILOCTOPUS_LIST_ID=
+
+# Create Beehiiv API key at https://developers.beehiiv.com/docs/v2/bktd9a7mxo67n-create-an-api-key
+BEEHIIV_API_KEY=
+BEEHIIV_PUBLICATION_ID=