[GraphQL] Add explorer iframe

[kodster28]

Summary

However, getting a Refused to display 'https://dash.cloudflare.com/' in a frame because it set 'X-Frame-Options' to 'deny'. error.

cc: @cf-ypark / @soheiokamoto

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PR Change Summary

Added a GraphQL explorer iframe and updated the getting started documentation to include a link to the new explorer.

• Introduced a new GraphQL explorer iframe in the documentation.
• Updated the getting started page to include a link to the GraphQL explorer.
• Modified content type for the getting started page from 'get-started' to 'navigation'.

Modified Files

• src/content/docs/analytics/graphql-api/getting-started/index.mdx

Added Files

• src/content/docs/analytics/graphql-api/getting-started/explorer.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/analytics/	@jimhawkridge, @soheiokamoto, @angelampcosta, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://02dac78d.preview.developers.cloudflare.com
Preview Branch URL: https://graphql-analytics-iframe.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/analytics/graphql-api/getting-started/	https://graphql-analytics-iframe.preview.developers.cloudflare.com/analytics/graphql-api/getting-started/
https://developers.cloudflare.com/analytics/graphql-api/getting-started/explorer/	https://graphql-analytics-iframe.preview.developers.cloudflare.com/analytics/graphql-api/getting-started/explorer/