Add mermaid figure depicting our relationship to/between the projects we are involved in

We have https://centerforopenneuroscience.org/projects but it is "boring" and not really exhaustive and does not provide adequate relationship between projects. Inspired by our with @candleindark drawings of mermaid diagrams, like in

- https://docs.dandiarchive.org/21_models_integration/
- https://github.com/bids-standard/bids-website/pull/626

So I wondered if we could/should depict projects and potentially with some grouppings... Criteria for inclusion could be quite loose, and the goal here would be mostly to orient visitors in the "universe" of the neuro projects which we are involved with... Very likely there could be even more detailed, more project oriented "subplots" (e.g. for DANDI, DataLad, etc) where it would be like centering a mind-tree over that project and potentially bringing more distant relationships which are not necessarily where CON is involved.

- Standards
- BIDS
- NWB
- HED
- DANDI schema
- Platforms/Services
- DataLad
- registry.datalad.org
- datasets.datalad.org
- DANDI
- dandi-cli
- webdav.dandiarchive.org
- ...
- Tools
- con/duct
- ...

and may be even potentially somehow people who are involved with any particular one although that might be too much.

For now just in the state of conceptualization unless someone would jump ahead and suggests a draft ;)