feat(onboarding.md): add further GWDG resources to onboarding

Added some more detail to some, self-explanatory has been condensed into a list

closses #79

chapters/onboarding.md

@@ -33,9 +33,10 @@ We assume a basic familiarity with basal technologies such as XML.
 
 \
 
-- DARIAH-wikispace SUB-GWDG-IT
+- DARIAH wikispace [SUB-GWDG-IT](https://wiki.de.dariah.eu/display/FEAD)
 - (possibly further project-related wikispaces)
-- Kanboard-user group FE
+- OpenProject [Project FE Develop](https://projects.academiccloud.de/projects/fe-develop/)
+- FE's Space in the [SUB Confluence Wiki](https://intranet.sub.uni-goettingen.de/pages/viewpage.action?spaceKey=FE&title=FE+-+Forschung+und+Entwicklung)
 - (possibly project-related SUB-intranet-spaces)
 
 ### Mailing Lists
@@ -58,7 +59,17 @@ The main discussion takes place at [Slack](https://exist-db.slack.com/), though.
 - relevant [TEI-lists](https://tei-c.org/support/#tei-l):
 A place to ask your questions about TEI.
 
-### Services by the Computing Center (GWDG)
+### Services by the Datacenter (GWDG)
+
+The university's datacenter offers a wide range of tools and services. All of
+these are accessible via your GWDG account, some might require an additional
+short notice to the GWDG's support to activate them.
+
+#### First Things First: GÖNET VPN
+
+Some of the services provided by the GWDG or the university itself you will need
+to access from the Göttingen Campus Network. You can find information on how to
+correctly set up your VPN connection [here](https://docs.gwdg.de/doku.php?id=en:services:network_services:vpn:start).
 
 #### Cloud Server
 
@@ -74,6 +85,47 @@ After creation of the machine you will get the root password. You SHOULD set up
 
 To make the VM available from Gönet (campus network) only, please set a rule for TCP Port 22 CIDR 134.76.0.0/16 and 10.0.0.0/16.
 
+#### GitLab
+
+The GWDG operates a [GitLab-Instance](https://gitlab.gwdg.de). This should be
+your go-to for hosting projects.
+
+There is also a [generic template](https://gitlab.gwdg.de/mgoebel/slides) for
+creating presentations with [reveal.js](https://revealjs.com/) you can fork.
+
+#### HedgeDoc
+
+[HedgeDoc](https://pad.gwdg.de/) is a useful tool for collaborative writing,
+note-taking, and presentation. Beyond markdown and slides features, HedgeDoc
+has several other plugins, such as MathJax for mathematical formulae and Mermaid
+for diagrams.
+
+#### Jupyter Cloud
+
+For use cases of Python, Julia, or R, there is [Jupyter-Hub](https://jupyter-cloud.gwdg.de/).
+There is also the possibility of using a more powerful instance running on the
+GWDG's HPC clusters (only Python and R, [Documentation](https://docs.gwdg.de/doku.php?id=en:services:application_services:jupyter:hpc)).
+
+#### Rocket.Chat
+
+[Rocket.Chat](https://chat.gwdg.de/) sees extensive use, especially among software
+developers. Many projects maintain dedicated channels as well.
+
+There are two channels you need to be a member of: `#fe-abteilung` and `#fe-develop`.
+To join these, sign in to Rocket.Chat to activate your account, then notify one
+of the department heads that you'd like to join these channels.
+
+#### Further Tools and Services by the GWDG
+
+- Antivirus Software: [Sophos](http://antivir.gwdg.de/)
+- Cloud Storage: [OwnCloud](https://owncloud.gwdg.de/)
+- Project Management: [OpenProject](https://projects.academiccloud.de/)
+- [URL Shortener](https://url.gwdg.de/)
+- Video/Audio Conferences: [Big Blue Button](https://meet.gwdg.de/)
+
+These are just some of the tools and services provided you might find useful in
+your work. For further GWDG services, see [here](https://www.gwdg.de/de/services).
+
 ### Further Reading
 
 Beyond the points listed above, developers should consider looking into the media below for any further information that