refactor: rename get-started to Security Insights, move to applicatio…

[alexmoraru7]

…n-security

• Rename security-center/get-started.mdx → application-security/security-insights.mdx
• Update title from 'Get started' to 'Security Insights'
• Update product reference to application-security
• Add 301 redirect from /security-center/get-started/ to /application-security/security-insights/

Summary

Screenshots (optional)

Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The change adheres to the documentation style guide.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[cloudflare-docs-bot]

Review

⏸️ Automatic reviews for this PR are paused.

This PR has already received 2 automatic reviews. To run another review, a codeowner can comment /review or /full-review.

Tip: Keep PRs in draft mode until they are ready for review — the bot skips draft PRs automatically.

---

✅ No style-guide issues found in commit ff2efdd.

Commands

Only codeowners can run commands. Post a comment with the command to trigger it.

Command	Description
/review	Runs a review now. Incremental if a prior review exists, full if not.
/full-review	Re-reviews the entire PR diff from scratch, ignoring incremental history. Useful after a rebase, when you want a fresh review, or if the bot gets out of sync and reports issues that no longer exist.