provide details on how to add personal information on website

[danielelerede-oet]

Closes # (if applicable).

Changes Proposed in This Pull Request

Going through the onboarding process with @gianvito-colucci we noticed missing details on how to add new people on the website, so we added them to the Handbook Onboarding page.

Checklist

• [x] I tested my contribution locally, and it seems to work fine.
• [x] Code and workflow changes are sufficiently documented.
• [x] If new pages are added, maintainers are assigned for that document.
• [ ] If the document falls under a controlled category, a controlled document banner is present.

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