Add docs for releasing Phoenix assets

docs/releasing.md

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+---
+title: "Releasing"
+weight: 25
+geekdocRepo: https://github.com/owncloud/phoenix
+geekdocEditPath: edit/master/docs
+geekdocFilePath: releasing.md
+---
+
+{{< toc >}}
+
+## Releasing Phoenix
+
+The next generation Web Frontend is shipped as an ocis Extension. The `ocis-phoenix` extension is also embedded in the single binary and part of the `ocis server` command.
+
+This repository contains the assets and these must be released first before being bundled into `ocis-phoenix`.
+
+### Package Hierarchy
+
+- [ocis](https://githug.com/owncloud/ocis)
+    - [ocis-phoenix](https://github.com/owncloud/ocis-phoenix)
+      - [ocis-pkg](https://github.com/owncloud/ocis-pkg)
+      - [phoenix](https://github.com/owncloud/phoenix)
+
+#### Releasing Phoenix Frontend
+
+1. Create a branch `release-$version`. in <https://github.com/owncloud/phoenix>
+2. Create a Folder in `changelog` for the release version and date `mkdir $major.$minor.$patchVersion_YYYY-MM-DD`.
+3. Move all changelog items from the `changelog/unreleased/` folder to the `$major.$minor.$patchVersion_YYYY-MM-DD` folder.
+4. Commit your changes.
+5. After merging, wait for the CI to run on the merge commit.
+6. Go to the [Releases section](https://github.com/owncloud/phoenix/releases) and click "Draft a new Release".
+7. Use `v$major.$minor.$patch` as a tag (the `v` prefix is important) and publish it.
+8. The tag and the Release artifacts will be created automatically.
+
+#### Next steps
+
+The next steps are usually to update the Phoenix assets in the [ocis-phoenix](https://github.com/owncloud/ocis-phoenix) repository.
+