docs: 2.26 release notes

docs/release-notes/v2.26/index.md

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+# November.1 2020 (version 2.26)
+
+---
+
+Welcome to the November.1 2020 release of Gatsby (version 2.26). Key highlights of this release:
+
+- [New Image Plugin](#new-gatsby-image-beta) - access static images without GraphQL, high Lighthouse scores again
+- [File System Route API](#file-system-route-api) - create pages using filename conventions
+- [New Release Process](#new-release-process) - more stability and clarity around Gatsby releases
+- [gatsby-source-contentful v4.0](#gatsby-source-contentful) - new RichText implementation
+
+Other notable changes:
+
+- [Enable compression in the dev server](#enable-compression-in-the-dev-server) - speeds up remote previews
+- [gatsby-plugin-mdx](#gatsby-plugin-mdx) - performance improvements
+- [Notable bug-fixes](#)
+
+Sneak peek to next releases:
+
+- [Queries on Demand](#) - quicker `develop` startup for big sites
+- [create-gatsby](#) - better `gatsby new`
+- [Experimental: Lazy images in develop](#)
+
+**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).
+
+### New Gatsby Image (Beta)
+
+TODOC
+
+- [README](https://github.com/gatsbyjs/gatsby/tree/master/packages/gatsby-plugin-image)
+- [Discussion](https://github.com/gatsbyjs/gatsby/discussions/27950)
+
+### File System Route API
+
+TODOC
+
+### New Release Process
+
+TODOC
+
+### Enable compression in the dev server
+
+TODOC
+
+### gatsby-source-contentful
+
+TODOC
+
+### gatsby-plugin-mdx
+
+TODOC
+
+## Notable fixes
+
+TODOC
+
+- [1234](https://github.com/gatsby/gatsby/issues/1234): Example
+
+## Thank you
+
+A big **Thank You** to the following community members who contributed to this release:
+
+TODOC