Add Weni Events Guide and API to the navigation sidebar

[mariananantua]

What is the purpose of this pull request?

Add Weni Events Guide and API to the navigation.json.

This PR is linked to two others:

• Add Weni Events guide to the dev-portal-content repo.
• Add API schema to the openapi-schemas repo.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Requires change to documentation, which has been updated accordingly.

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