Assorted copy & URL updates

[jaffrepaul]

<!-- Use this checklist to make sure your PR is ready for merge. You may delete any sections you don't need. -->

## DESCRIBE YOUR PR
This PR makes two documentation updates:
1.  Removes "With insights," from the first paragraph of the Insights overview page (`docs/product/insights/overview/index.mdx`) to eliminate redundancy with the page's H2 and description.
2.  Adds content to the "Agent Pipelines vs Direct LLM Calls" callout on the Agents dashboard page (`docs/product/insights/agents/dashboard.mdx`). This provides important context on the difference between AI pipelines and direct LLM calls, and includes a link to relevant manual instrumentation documentation.

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## SLA

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## PRE-MERGE CHECKLIST

*Make sure you've checked the following before merging your changes:*

- [X] Checked Vercel preview for correctness, including links
- [ ] PR was reviewed and approved by any necessary SMEs (subject matter experts)
- [ ] PR was reviewed and approved by a member of the [Sentry docs team](https://github.com/orgs/getsentry/teams/docs)

## LEGAL BOILERPLATE

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Look, I get it. The entity doing business as "Sentry" was incorporated in the State of Delaware in 2015 as Functional Software, Inc. and is gonna need some rights from me in order to utilize my contributions in this here PR. So here's the deal: I retain all rights, title and interest in and to my contributions, and by keeping this boilerplate intact I confirm that 

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[codecov]

Bundle Report

Changes will increase total bundle size by 862.62kB (4.09%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-server-cjs	11.8MB	862.62kB (7.89%) ⬆️
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%
static/64EH76wd5xpFK93dwsezc/_buildManifest.js (New)	684 bytes	684 bytes	100.0% 🚀
static/64EH76wd5xpFK93dwsezc/_ssgManifest.js (New)	77 bytes	77 bytes	100.0% 🚀
static/_eFWOD9iKTJa-*.js (Deleted)	-684 bytes	0 bytes	-100.0% 🗑️
static/_eFWOD9iKTJa-*.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	287.54kB	691.95kB	71.1% ⚠️
../app/platform-redirect/page.js.nft.json	287.54kB	691.86kB	71.12% ⚠️
../app/sitemap.xml/route.js.nft.json	287.54kB	689.83kB	71.48% ⚠️

[sfanahata]

@jaffrepaul - can you share why you put this alert at the bottom of the page? I would have assumed this information would be more useful closer to the beginning of the doc where we start with "once you've set up the SDK".

[jaffrepaul]

The Alert component was already there, it just had no content in it 😀 There may be a larger convo around the best flow for this info, but (literally) filling in the gaps for now.