feat(olake-go): link the quickstart, GitHub and Slack in the FAQ

[krishnajain-15]

Summary

Three OLake Go FAQ answers now link to what they mention:

• "How to get started?" → "Quickstart Guide" links to /docs/getting-started/quickstart/
• "Is OLake Go really open source?" → "GitHub repository" links to https://github.com/datazip-inc/olake (new tab)
• "How can I contribute?" → "Slack community" links to /slack/

How

• ProductFaqItem takes an optional links list ({ text, href }). ProductFaq turns each phrase in the answer into a link, so the Fusion FAQ can use it too.
• The answer text stays plain, so the FAQPage JSON-LD built from it is unchanged.
• Links reuse the existing URL constants (GO_QUICKSTART is now exported from navItems.ts).

Testing

• Checked on the dev server: all three links point to the right place, GitHub opens in a new tab with noopener noreferrer, and the FAQ JSON-LD text is identical.
• Type check passes.