docs: fix broken links (remix-run#15113)

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: morgan-coded

docs/explanation/code-splitting.md

@@ -58,4 +58,4 @@ export default function Component({ loaderData }) {
 
 After building for the browser, only the `Component` will still be in the bundle, so you can use server-only code in the other module exports.
 
-[route-module]: ../../start/framework/route-module
+[route-module]: ../start/framework/route-module

docs/explanation/index-query-param.md

@@ -80,7 +80,7 @@ function Component() {
 }
 ```
 
-[loader]: ../api/data-routers/loader
+[loader]: ../start/data/route-object#loader
 [form_element]: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/form
 [form_component]: ../api/components/Form
-[action]: ../api/data-routers/action
+[action]: ../start/data/route-object#action

docs/how-to/security.md

@@ -27,4 +27,4 @@ If you are implementing a [Content-Security-Policy (CSP)][csp] in your applicati
 [renderToReadableStream]: https://react.dev/reference/react-dom/server/renderToReadableStream
 [scripts]: ../api/components/Scripts
 [scrollrestoration]: ../api/components/ScrollRestoration
-[serverrouter]: ../api/components/ServerRouter
+[serverrouter]: ../api/framework-routers/ServerRouter

docs/start/framework/actions.md

@@ -172,4 +172,3 @@ See the [Using Fetchers][fetchers] guide for more information.
 Next: [Navigating](./navigating)
 
 [fetchers]: ../../how-to/fetchers
-[data]: ../../api/react-router/data

docs/start/framework/installation.md

@@ -37,6 +37,5 @@ npx create-react-router@latest --template remix-run/react-router-templates/<temp
 
 Next: [Routing](./routing)
 
-[manual_usage]: ../how-to/manual-usage
 [default-template]: https://github.com/remix-run/react-router-templates/tree/main/default
 [react-router-templates]: https://github.com/remix-run/react-router-templates