chore(docs): Release Notes for 5.7

docs/docs/reference/release-notes/v5.7/index.md

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+---
+date: "2023-02-21"
+version: "5.7.0"
+title: "v5.7 Release Notes"
+---
+
+Welcome to `gatsby@5.7.0` release (February 2023 #2)
+
+Check out [notable bugfixes](#notable-bugfixes--improvements).
+
+**Bleeding Edge:** Want to try new features as soon as possible? Install `gatsby@next` and let us know if you have any [issues](https://github.com/gatsbyjs/gatsby/issues).
+
+[Previous release notes](/docs/reference/release-notes/v5.6)
+
+[Full changelog][full-changelog]
+
+---
+
+## Notable bugfixes & improvements
+
+- `gatsby`: Improve memory usage in `gatsby develop` command, via [PR #37619](https://github.com/gatsbyjs/gatsby/pull/37619)
+- `gatsby-source-contentful`: Fix engine validation, via [PR #37660](https://github.com/gatsbyjs/gatsby/pull/37660)
+
+## Contributors
+
+A big **Thank You** to [our community who contributed][full-changelog] to this release 💜
+
+- [MarcusCole518](https://github.com/MarcusCole518): chore(docs): update cloud docs [PR #37652](https://github.com/gatsbyjs/gatsby/pull/37652)
+- [adnjoo](https://github.com/adnjoo): chore(docs): Update MDX layout template instructions [PR #37615](https://github.com/gatsbyjs/gatsby/pull/37615)
+- [gh640](https://github.com/gh640): chore(docs): Fix typo in Head API reference [PR #37630](https://github.com/gatsbyjs/gatsby/pull/37630)
+- [leerob](https://github.com/leerob): chore(docs): Update Vercel hosting information [PR #37551](https://github.com/gatsbyjs/gatsby/pull/37551)
+- [marvinjude](https://github.com/marvinjude): chore(docs): Docs for `wrapRootElement` + `Head` [PR #37519](https://github.com/gatsbyjs/gatsby/pull/37519)
+
+[full-changelog]: https://github.com/gatsbyjs/gatsby/compare/gatsby@5.7.0-next.0...gatsby@5.7.0