feat(go): refactor initial guide pages

[giortzisg]

DESCRIBE YOUR PR

Part of a refactoring initiative for the Go SDK docs pages. This PR mostly aims for consistency among all it's guides index pages. Things changed:

• Every page uses the getting-started-config to avoid snippets not correctly including all available onboarding options.
• Make snippets pastable (thus removing main function and whole package declarations).
• Divide parts of the snippets to different sections (Install, Configure, Options, Verify). Aim for pages to follow this format if possible.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
sentry-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 8, 2025 0:13am

1 Skipped Deployment

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[codecov]

Bundle Report

Changes will increase total bundle size by 4.65kB (0.02%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-server-cjs	11.8MB	4.66kB (0.04%) ⬆️
sentry-docs-client-array-push	9.8MB	-6 bytes (-0.0%) ⬇️

Affected Assets, Files, and Routes:

view changes for bundle: sentry-docs-client-array-push

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
static/chunks/pages/_app-*.js	-3 bytes	873.24kB	-0.0%
static/chunks/7750-*.js	-3 bytes	415.85kB	-0.0%
server/middleware-*.js	-5.55kB	1.0kB	-84.74%
server/middleware-*.js	5.55kB	6.55kB	555.3% ⚠️
static/ZdhKoMnoUNEMJaEH4hwLy/_buildManifest.js (New)	684 bytes	684 bytes	100.0% 🚀
static/ZdhKoMnoUNEMJaEH4hwLy/_ssgManifest.js (New)	77 bytes	77 bytes	100.0% 🚀
static/lFf0jbHWvetMuGIAkEHVT/_buildManifest.js (Deleted)	-684 bytes	0 bytes	-100.0% 🗑️
static/lFf0jbHWvetMuGIAkEHVT/_ssgManifest.js (Deleted)	-77 bytes	0 bytes	-100.0% 🗑️

view changes for bundle: sentry-docs-server-cjs

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
1729.js	-3 bytes	1.64MB	-0.0%
../instrumentation.js	-3 bytes	973.36kB	-0.0%
9523.js	-3 bytes	949.31kB	-0.0%
../app/[[...path]]/page.js.nft.json	1.56kB	692.2kB	0.23%
../app/platform-redirect/page.js.nft.json	1.56kB	692.12kB	0.23%
../app/sitemap.xml/route.js.nft.json	1.56kB	690.09kB	0.23%