Improve quickstart page clarity and navigation

[mintlify]

Enhanced the quickstart guide with clearer prerequisites, structured deployment steps, and expanded next steps section. Improved readability by converting prose into step-by-step components and adding more actionable guidance for new users.

Files changed:

• quickstart.mdx - Added GitHub requirement upfront, converted deployment instructions to Steps component, simplified accordion to Tip callout, changed Tip to Note for custom domain section, and expanded next steps from 3 to 6 cards in a 2-column CardGroup layout

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Note

Low Risk
Documentation-only MDX changes (layout/copy and component swaps) with no runtime/business logic impact; main risk is minor rendering regressions if MDX components are misused.

Overview
Improves the Quickstart guide by making prerequisites explicit (adds GitHub requirement) and rewriting the deployment section from prose into a structured <Steps> flow with clearer onboarding actions.

Replaces the optional GitHub-connection accordion with a simpler <Tip> callout, switches the custom-domain callout from <Tip> to <Note>, and expands the Next steps section into a 2-column <CardGroup> with additional navigation cards (theme, navigation organization, API docs).

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