Add Nebula participants to the website

[NPDebs]

👍🎉 First of all, thanks for taking the time to contribute! 🎉👍

FOR CONTRIBUTOR

• I have read the CONTRIBUTING.md document

PR Type:

• This PR adds a new blog post
• This PR does something else (explain above)

This PR fixes #908.
Changes made:

• Fixed failure from logic in open-seeds/about.md - line 296.
• Added experts

To be done:

• Display previous cohorts
• Add mentees, mentors and projects

FOR REVIEWERS

Thanks for taking the time to review! ❤️

Here are the list of things to make sure of:

• The website builds (a check will fail if not)
• All images have been added within the Pull Request and they have Alt text
• If there are paragraphs or text, the key messages are highlighted
• All internal links (within OLS website) use the {% link path_to_file.md %} format
• The preview corresponds to the changes described in the Pull Request
• The code is tidy and passes the linting tests

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[iramosp]

@NPDebs, thanks for working on this! I looked at the deploy preview, and I have a couple of comments:

1. All experts and participants from the pilot seem to be on the subpage, but they all show up as experts. Is the information we have on Civi enough to assign the correct roles to each individual?
2. Can we also add facilitators?
3. For consistency, we are using the term "Participants" rather than "Mentees" for Nebula. Is it possible to change this in the subpage?
4. Follow-up question: I have some ideas about updating the template text for each cohort subpage, for example, having Nebula-specific role descriptions and goals. I think this should go in another issue, but for now, could you point me to the right file I should look at?