Add deployment workflow instructions (#134)

Author: marcel-veselka

AGENTS.md

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+# AGENTS.md
+
+## Deployment workflow
+
+We maintain three repositories with a linear promotion flow:
+
+- **website**: main development repository; deployed to **website.wopee.io** for testing purposes **(should not be indexed)**.
+- **website-prod**: fork of `website`, kept in sync and deployed to **wopee.io**.
+- **website-testing**: fork of `website`, used for testing after development, before production; deployed for testing purposes **(should not be indexed)**.
+
+### How we work
+
+1. Develop on a new branch in `website`.
+2. Test locally on that branch.
+3. If OK, sync to `website-testing` branch and test further.
+4. If OK, sync to `website-prod` branch and test further.
+
+If a change does not require thorough testing, sync/deploy to both forks at once.