feat(rust): document how to set up source context

[lcian]

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Closes #9625

This is the process we use for relay.
It works on Linux, we can add MacOs and Windows later.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
sentry-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 2, 2025 1:35pm

2 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
changelog	⬜️ Ignored (Inspect)	Visit Preview		Apr 2, 2025 1:35pm
develop-docs	⬜️ Ignored (Inspect)	Visit Preview		Apr 2, 2025 1:35pm

[codecov]

Bundle Report

Changes will increase total bundle size by 183 bytes (0.0%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-server-cjs	10.6MB	189 bytes (0.0%) ⬆️
sentry-docs-client-array-push	9.44MB	-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	869.55kB	-0.0%
static/chunks/4612-*.js	-3 bytes	398.04kB	-0.0%
server/middleware-*.js	5.55kB	6.55kB	555.3% ⚠️
server/middleware-*.js	-5.55kB	1.0kB	-84.74%
static/NleDULQaqhoRMdJ0NRyKf/_buildManifest.js (New)	578 bytes	578 bytes	100.0% 🚀
static/NleDULQaqhoRMdJ0NRyKf/_ssgManifest.js (New)	77 bytes	77 bytes	100.0% 🚀
static/YrPdcrB410pBVtXjW3Aow/_buildManifest.js (Deleted)	-578 bytes	0 bytes	-100.0% 🗑️
static/YrPdcrB410pBVtXjW3Aow/_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	1.58MB	-0.0%
../instrumentation.js	-3 bytes	910.48kB	-0.0%
9523.js	-3 bytes	886.53kB	-0.0%
../app/[[...path]]/page.js.nft.json	66 bytes	383.2kB	0.02%
../app/platform-redirect/page.js.nft.json	66 bytes	383.12kB	0.02%
../app/sitemap.xml/route.js.nft.json	66 bytes	381.09kB	0.02%