[DOCS-10786] Reference Table updates

[rtrieu]

What does this PR do? What is the motivation?

Merge instructions

Per PM request this PR:

• Creates a card layout to list all available reference table integration providers (the CSV upload one is a placeholder)
• Adds a section about the automatic update frequency
• Adds a couple of Further Reading links

Merge readiness:

• [ ] Ready for merge

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Additional notes

[github-actions[bot]]

✅ Documentation Team Review

The documentation team has approved this pull request. Thank you for your contribution!

[github-actions[bot]]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/rtrieu/docs-10786-reference-tables/reference_tables/

[rtrieu]

Thanks @buraizu, I checked it out and discovered that the section doesn't expand by default if the expanded parameter is listed before a different parameter 🤷‍♀️