Merge branch '187-mattermost-announcement-new-6-1-release' into 'master'

Resolve "Mattermost announcement new 6.1 release"

Closes #187

See merge request !364

_posts/2022/2022-01-14-mattermost-6-available.md

+---
+title: "Mattermost Major Release 6 available"
+title_image: jamie-street-p2ifKHu3dXM-unsplash.jpg
+date: 2022-01-14
+authors:
+  - huste
+  - ziegner
+  - hueser
+layout: blogpost
+categories:
+  - news
+excerpt: >
+  Since January 14<sup>th</sup>, 2022, the Mattermost service in the Helmholtz Cloud
+  appears in new splendor equipped with two new main features.
+  Mattermost now comes with channels, boards and playbooks integrated
+  into one single application.
+---
+
+## What's New
+
+Since January 14<sup>th</sup>, 2022, the
+[Mattermost service](https://mattermost.hzdr.de) in the
+[Helmholtz Cloud](https://cloud.helmholtz.de) appears
+in new splendor equipped with two new main features.
+Mattermost now comes with
+[channels](https://docs.mattermost.com/guides/channels.html),
+[boards](https://docs.mattermost.com/guides/boards.html) and
+[playbooks](https://docs.mattermost.com/guides/playbooks.html)
+integrated into one single application.
+The global navigation was redesigned providing Mattermost with a new look and feel.
+All details and new features are described in the Mattermost release posts.
+
+* <https://mattermost.com/blog/mattermost-v6-0-is-now-available/>
+* <https://mattermost.com/blog/mattermost-v6-1-is-now-available/>
+
+## Enhanced Documentation
+
+We also took the opportunity to make it easier to get started
+by extending the documentation.
+The brand-new getting started guide helps you to quickly get in touch with the
+service and the specifics of the installation.
+We hope it helps to allow new colleagues and users to quickly get familiar
+with Mattermost.
+The most recent changes are now described in the Changelog.
+
+* [Getting Started Guide](https://hifis.net/doc/software/mattermost/getting-started/)
+* [Changelog](https://hifis.net/doc/software/mattermost/changelog/)
+
+## Try it Out
+
+Have you ever been annoyed by the unstructured views of the various topics
+in channels?
+Try out [Collapsed Reply Threads](https://hifis.net/doc/software/mattermost/getting-started/#collapsed-reply-threads)
+by activating it in your user settings.
+
+### Comments and Suggestions
+
+If you have suggestions or questions, please do not hesitate to contact us.
+
+<a href="{% link contact.md %}"
+                            class="btn btn-outline-secondary"
+                            title="HIFIS Helpdesk">
+                            Contact us! <i class="fas fa-envelope"></i></a>