[DOC] Add GoldSky to the Indexing solutions

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Documentation Type

New Documentation

What needs documentation?

GoldSky is a hosted solution for indexing blockchains that recently added NEAR support (sponsored via Infrastructure Committee)

See more details and their walk-through video: https://t.me/NEARDevHub/670

Acceptance Criteria

• GoldSky must be searchable in our docs
• GoldSky must be discoverable when reading about Indexers and Data Infrastructure

Resources & References

No response

Priority

🔴 P0 : Missing Critical Documentation

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More content: https://x.com/neardevhub/status/2019093655618027792?s=46