fix: [torrust#4] index page not being preendered

It fixes this error building the app:

```
node:internal/event_target:1100
  process.nextTick(() => { throw err; });
                           ^
Error: The following routes were marked as prerenderable, but were not prerendered because they were not found while crawling your app:
  - /(pages)/index

See https://kit.svelte.dev/docs/page-options#prerender-troubleshooting for info on how to solve this
    at prerender (file:///home/josecelano/Documents/git/committer/me/github/torrust/torrust-website-v2/node_modules/@sveltejs/kit/src/core/postbuild/prerender.js:505:9)
    at async MessagePort.<anonymous> (file:///home/josecelano/Documents/git/committer/me/github/torrust/torrust-website-v2/node_modules/@sveltejs/kit/src/utils/fork.js:22:16)
Emitted 'error' event on Worker instance at:
    at [kOnErrorMessage] (node:internal/worker:326:10)
    at [kOnMessage] (node:internal/worker:337:37)
    at MessagePort.<anonymous> (node:internal/worker:232:57)
    at [nodejs.internal.kHybridDispatch] (node:internal/event_target:826:20)
    at MessagePort.<anonymous> (node:internal/per_context/messageport:23:28)

Node.js v20.12.2
```

src/lib/components/organisms/Header.svelte

@@ -20,13 +20,13 @@
 		<div class="links-wrapper">
 			<ul class="links">
 				<li>
-					<a href="/index" class={currentPath === '/index' ? 'active' : ''} on:click={toggleMenu}
+					<a href="/torrent-index" class={currentPath === '/torrent-index' ? 'active' : ''} on:click={toggleMenu}
 						>Index</a
 					>
 				</li>
 				<li>
 					<a
-						href="/tracker"
+						href="/torrent-tracker"
 						class={currentPath === '/tracker' ? 'active' : ''}
 						on:click={toggleMenu}>Tracker</a
 					>