docs: add changelog for 0.28

docs/changelogs/v0.28.md

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+# Kubo changelog v0.28
+
+- [v0.28.0](#v0280)
+
+## v0.28.0
+
+- [Overview](#overview)
+- [🔦 Highlights](#-highlights)
+  - [Gateway: `/api/v0` is removed](#gateway-apiv0-is-removed)
+- [📝 Changelog](#-changelog)
+- [👨‍👩‍👧‍👦 Contributors](#-contributors)
+
+### Overview
+
+### 🔦 Highlights
+
+#### Gateway: `/api/v0` is removed
+
+The legacy subset of the Kubo RPC that was available via the Gateway port and was deprecated is now completely removed. You can read more in <https://github.com/ipfs/kubo/issues/10312>.
+
+If you have a legacy software that relies on this behavior, and want to expose parts of `/api/v0` next to `/ipfs`, use reverse-proxy in front of Kubo to mount both Gateway and RPC on the same port. NOTE: exposing RPC to the internet comes with security risk: make sure to specify access control via [API.Authorizations](https://github.com/ipfs/kubo/blob/master/docs/config.md#apiauthorizations).
+
+### 📝 Changelog
+
+### 👨‍👩‍👧‍👦 Contributors