Bug: routeRules not working with non-root baseUrl #27

* Plugin version: `@signalwire/docusaurus-plugin-llms-txt@1.2.2`
* Deployment target: GitLab Pages

* `routeRules` are not applied
* `llms.txt` only contains a `## documentations` section
* Expected sections like `## Docs` (from `/documentations/user-manual/docs`) are missing

* `routeRules` work correctly
* All sections (Docs, Blog, Announcements) appear properly in `llms.txt`

* `excludeRoutes` works correctly with both root and non-root `baseUrl` when prefixed with `${baseUrl}`
* Relative paths in `llms.txt` are correct for both `baseUrl` configurations (e.g., `/announcements/2024/10/06/article.md` without the baseUrl prefix)

`const baseUrl = "/documentations/user-manual/";

export default {
  baseUrl: baseUrl,
  plugins: [
    [
      '@signalwire/docusaurus-plugin-llms-txt',
      {
        content: {
          includeBlog: true,
          enableLlmsFullTxt: true,
          excludeRoutes: [
            `${baseUrl}search/`,
            `${baseUrl}blog/`, 
            `${baseUrl}blog/page/*`,   
            `${baseUrl}blog/tags/**`,  
            `${baseUrl}blog/archive/`, 
          ],
          routeRules: [
            {
              route: `/docs/**`,  // Doesn't work ✗
              depth: 1,
              categoryName: 'Docs'
            },
            {
              route: `/blog/**`,  // Doesn't work ✗
              depth: 1,
              categoryName: 'Blog'
            },
            {
              route: `/announcements/**`,  // Doesn't work ✗
              depth: 1,
              categoryName: 'Announcements'
            }
          ],
        }
      },
    ],
  ],
};
`

`// All of these failed to work with non-root baseUrl:
route: `/docs/**`
route: `docs/**`
route: `**/docs/**`
route: `${baseUrl}/docs/**`
route: `${baseUrl}docs/**`
`