Add link to slides for FOSDEM (ORDEM) KMS talk

[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)

In the events page, details about the KMS talk delivered at FOSDEM (ORDEM) does not include a link to the slides. This PR adds a link to the presentation.

FOR REVIEWERS

Thanks for taking the time to review! ❤️

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• The website builds (a check will fail if not)
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• 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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