feat: link to computational resources

[wesleyboar]

Change

On behalf of @silviamazzoni:

Add a link Computational Workflows on DesignSafe to Tools & Apps.

Original Request

[…] new link in the User guides, right below Training Resources in Tools and apps, and above Popular. Title: "Computational Workflows on DesignSafe" unless you have a better title, […] just like […] API Deceloper's Guide, to https://designsafe-ci.github.io/training-OpenSees-on-DesignSafe/Docs_MD/Oview_ComputationalWorkflow.html

Testing

https://deploy-preview-248--ds-user-guide.netlify.app/training/

Concerns

1. Name is too long for nav.
2. Should link be within Training Resources page instead?
   ^{Page can be organized to accommodate new link.}

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