adding context on Goldsky

[hemaaanth]

• Mention on 'building-with-pgn' page
• Creation of dedicated 'subgraphs' page (+ updated metadata to reflect)
• Mention on 'faq' page

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Name	Status	Preview	Comments	Updated (UTC)
pgn-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 25, 2023 4:47am