init: astro publish site with newsletter, search, and actions workflow

.env.example

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+SITE_URL="https://example.com"
+
+# Newsletter subscribe form endpoint.
+# Examples:
+# - Buttondown: https://buttondown.email/api/emails/embed-subscribe/<your-list>
+# - ConvertKit: https://app.convertkit.com/forms/<id>/subscriptions
+PUBLIC_NEWSLETTER_ACTION=""
+
+# The email input field name expected by your provider (often "email").
+PUBLIC_NEWSLETTER_EMAIL_FIELD="email"
+
+# Optional: display copy
+PUBLIC_NEWSLETTER_TITLE="Subscribe"
+PUBLIC_NEWSLETTER_DESCRIPTION="Get new posts in your inbox."