chore: Update custom visualizations guide

[JuliaNocera]

Description

• Adds an entry to the configuration section for the enum type
• adds video tutorial for building a custom visualization

Reviewer Notes

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Related Issue(s) / Ticket(s)

If there are any related GitHub Issues or JIRA tickets, add links to them here.

• issue

Screenshot(s)

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Use Conventional Commits

Please help the maintainers by leveraging the following conventional commit
standards in your pull request title and commit messages.

Use chore

• for minor changes / additions / corrections to content.
• for minor changes / additions / corrections to images.
• for minor non-functional changes / additions to github actions, github templates, package or config updates, etc

git commit -m "chore: adjusting config and content"

Use fix

• for minor functional corrections to code.

git commit -m "fix: typo and prop error in the code of conduct"

Use feat

• for major functional changes or additions to code.

git commit -m "feat(media): creating a video landing page"

[nr-opensource-bot]

🎉 This PR is included in version 1.35.7 🎉

The release is available on GitHub release

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