docs: prepare 1.29 release notes

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

docs/releases/v1.29.0.md

@@ -0,0 +1,40 @@
+---
+id: v1.29.0
+title: v1.29.0
+description: Backstage Release v1.29.0
+---
+
+These are the release notes for the v1.29.0 release of [Backstage](https://backstage.io/).
+
+A huge thanks to the whole team of maintainers and contributors as well as the amazing Backstage Community for the hard work in getting this release developed and done.
+
+## Highlights
+
+### <title>
+
+<short description>. Contributed by @<user> in [#<pr>](https://github.com/backstage/backstage/pull/<pr>)
+
+## Security Fixes
+
+This release does not contain any security fixes.
+
+<or>
+
+@backstage/<package-name>, please upgrade to the latest version if you are using this module.
+
+## Upgrade path
+
+We recommend that you keep your Backstage project up to date with this latest release. For more guidance on how to upgrade, check out the documentation for [keeping Backstage updated](https://backstage.io/docs/getting-started/keeping-backstage-updated).
+
+## Links and References
+
+Below you can find a list of links and references to help you learn about and start using this new release.
+
+- [Backstage official website](https://backstage.io/), [documentation](https://backstage.io/docs/), and [getting started guide](https://backstage.io/docs/getting-started/)
+- [GitHub repository](https://github.com/backstage/backstage)
+- Backstage's [versioning and support policy](https://backstage.io/docs/overview/versioning-policy)
+- [Community Discord](https://discord.gg/backstage-687207715902193673) for discussions and support
+- [Changelog](https://github.com/backstage/backstage/tree/master/docs/releases/v1.29.0-changelog.md)
+- Backstage [Demos](https://backstage.io/demos), [Blog](https://backstage.io/blog), [Roadmap](https://backstage.io/docs/overview/roadmap) and [Plugins](https://backstage.io/plugins)
+
+Sign up for our [newsletter](https://info.backstage.spotify.com/newsletter_subscribe) if you want to be informed about what is happening in the world of Backstage.

microsite/docusaurus.config.ts

@@ -241,7 +241,7 @@ const config: Config = {
           position: 'left',
         },
         {
-          to: 'docs/releases/v1.28.0',
+          to: 'docs/releases/v1.29.0',
           label: 'Releases',
           position: 'left',
         },

microsite/sidebars.json

@@ -1,6 +1,7 @@
 {
   "releases": {
     "Release Notes": [
+      "releases/v1.29.0",
       "releases/v1.28.0",
       "releases/v1.27.0",
       "releases/v1.26.0",