docs(js): Quick Start guides: Auth tokens in env files

[inventarSarah]

In this PR, I've updated the Source Maps section in the Quick Start guides (manual setup) to ensure we recommend storing the Sentry auth token in an environment file instead of directly in the config files.

Updated for SDKs:

• Nuxt
• React Router Framework
• Solidstart

Closes: #13896

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Name	Status	Preview	Comments	Updated (UTC)
sentry-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 26, 2025 9:18pm

1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
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[codecov]

Bundle Report

Changes will decrease total bundle size by 15 bytes (-0.0%) ⬇️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-server-cjs	10.93MB	-9 bytes (-0.0%) ⬇️
sentry-docs-client-array-push	9.8MB	-6 bytes (-0.0%) ⬇️

Affected Assets, Files, and Routes:

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%

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	6.55kB	555.3% ⚠️
server/middleware-*.js	-5.55kB	1.0kB	-84.74%
static/1pGoEQeRKcCnNWjtBXpZQ/_buildManifest.js (New)	684 bytes	684 bytes	100.0% 🚀
static/1pGoEQeRKcCnNWjtBXpZQ/_ssgManifest.js (New)	77 bytes	77 bytes	100.0% 🚀
static/3scQsY56Wg0Hud3y4edxX/_buildManifest.js (Deleted)	-684 bytes	0 bytes	-100.0% 🗑️
static/3scQsY56Wg0Hud3y4edxX/_ssgManifest.js (Deleted)	-77 bytes	0 bytes	-100.0% 🗑️

[coolguyzone]

Looks good! 🎸

[s1gr1d]

I looked specifically on the Nuxt code, that's perfect 👍

[andreiborza]

Solidstart looking... solid 😅