Add docs for releasing

docs/releasing.md

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+---
+title: "Releasing Phoenix in oCIS"
+weight: 25
+geekdocRepo: https://github.com/owncloud/phoenix
+geekdocEditPath: edit/master/docs
+geekdocFilePath: building.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.
+
+To update this package within all the deliveries, we need to update the package in the following chain from the bottom to the top.
+
+### Package Hierarchy
+
+```markdown
+- [ ] [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 "Releases" in GH click "Draft a new Release".
+7. Use `v$major.$minor.$patch` as a tag (the `v` prefix is important) and publish it.
+8. The tag and the Release artifacts will be created automatically.
+
+#### Updating ocis-phoenix
+
+1. Create a branch `release-$version`. in <https://github.com/owncloud/ocis-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. Update the go module `ocis-pkg` to the latest version <https://blog.golang.org/using-go-modules> .
+5. Update the phoenix asset in the Makefile.
+6. Create Changelog item for the Update in the `$major.$minor.$patchVersion_YYYY-MM-DD` folder.
+7. Commit your changes.
+8. After merging, wait for the CI to run on the merge commit.
+9. Go to "Releases" in GH click "Draft a new Release".
+10. Use `v$major.$minor.$patch` as a tag (the `v` prefix is important) and publish it.
+11. The tag and the Release artifacts will be created automatically.
+
+#### Updating the embedded ocis root command