Community website: link to Helmholtz Forum Research Software

Leftover from https://gitlab.hzdr.de/hifis/overall/hifis.net/-/merge_requests/630#note_2635944

[UK]: @tfoerst1 @christian.meessen One thing is still open for the community website: The link and respective paragraph to the "Helmholtz Forum: Research Software" is missing (could be linked to https://os.helmholtz.de/veranstaltungen/foren/). I think it will become more important as a HIFIS user forum ... (as recommended during Evaluation). I could deliver the text if needed.

Task:

• Write paragraph about Helmholtz Forum: Research Software
• Add the paragraph to community website