ref(insights): move performance docs under insights

[DominikB2014]

Work for getsentry/sentry#84021

We are removing the performance link from the sidebar, all performance pages will fall under insights.

This PR isn't to be merged for a few days until the performance link is removed, but we should have doc changes ready.

This PR updates the docs to reflect the layout of the product.

1. Most of /product/performance is moved to /product/insights/overview
2. The exception to the above is the setup, retention priorities and performance overhead as these pages are more generic to insights
3. Adds redirect for old perf pages -> insights
4. Updates links for old perf pages to use insights links
5. Some features are getting removed like web vitals in the transaction summary, information about those features have been removed

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
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[codecov]

Bundle Report

Changes will increase total bundle size by 320 bytes (0.0%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-server-cjs	10.93MB	-363 bytes (-0.0%) ⬇️
sentry-docs-edge-server-array-push	375.72kB	689 bytes (0.18%) ⬆️
sentry-docs-client-array-push	9.39MB	-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	1.71MB	-0.0%
../instrumentation.js	-3 bytes	1.04MB	-0.0%
9523.js	-3 bytes	1.02MB	-0.0%
../app/[[...path]]/page.js.nft.json	-118 bytes	375.94kB	-0.03%
../app/platform-redirect/page.js.nft.json	-118 bytes	375.85kB	-0.03%
../app/sitemap.xml/route.js.nft.json	-118 bytes	373.82kB	-0.03%

view changes for bundle: sentry-docs-edge-server-array-push

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
src/middleware.js	689 bytes	205.04kB	0.34%

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	865.35kB	-0.0%
static/chunks/1298-*.js	-3 bytes	401.61kB	-0.0%
server/middleware-*.js	-5.55kB	1.0kB	-84.74%
server/middleware-*.js	5.55kB	6.55kB	555.3% ⚠️
static/ytVh_0hfMCjRyCwtwaGQ_/_buildManifest.js (New)	578 bytes	578 bytes	100.0% 🚀
static/ytVh_0hfMCjRyCwtwaGQ_/_ssgManifest.js (New)	77 bytes	77 bytes	100.0% 🚀
static/9QyTe6WPcQyFyh3uy7TkZ/_buildManifest.js (Deleted)	-578 bytes	0 bytes	-100.0% 🗑️
static/9QyTe6WPcQyFyh3uy7TkZ/_ssgManifest.js (Deleted)	-77 bytes	0 bytes	-100.0% 🗑️

[gggritso]

👀 the changes look fine to me, but it should really be up to a PM to decide if things still make sense!

I think the Insights overview page does a good job of explaining that it's about performance and tracing, but users might find it strange that generic-looking links like "our performance product" became "our insights product" (or similar, I'm just making up an example), since "Insights" is Sentry jargon

[DominikB2014]

👀 the changes look fine to me, but it should really be up to a PM to decide if things still make sense!

@gggritso yup makes sense! These are changes that I spoke to @bcoe about already, he'll review these changes as well. We might tweak things to account for your feedback