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docusaurus-start doesn't work with projects that contain "pages" in their path

See original GitHub issue

🐛 Bug Report

Dev server crashes on file copy of files that contain pages in their path.

❯ yarn start
yarn run v1.19.1
warning package.json: No license field
$ docusaurus-start
LiveReload server started on port 35729
Docusaurus server started on port 3000
Error: ENOENT: no such file or directory, copyfile '/some_project/gitlab-pages/website/pages/en/index.js' -> '/some_project/gitlab-pages/website/node_modules/docusaurus/lib/pages/website/'
    at Object.copyFileSync (fs.js:1801:3)
    at copyFile (/some_project/gitlab-pages/website/node_modules/fs-extra/lib/copy-sync/copy-sync.js:68:8)
    at onFile (/some_project/gitlab-pages/website/node_modules/fs-extra/lib/copy-sync/copy-sync.js:53:25)
    at getStats (/some_project/gitlab-pages/website/node_modules/fs-extra/lib/copy-sync/copy-sync.js:48:44)
    at startCopy (/some_project/gitlab-pages/website/node_modules/fs-extra/lib/copy-sync/copy-sync.js:38:10)
    at handleFilterAndCopy (/some_project/gitlab-pages/website/node_modules/fs-extra/lib/copy-sync/copy-sync.js:33:10)
    at Object.copySync (/some_project/gitlab-pages/website/node_modules/fs-extra/lib/copy-sync/copy-sync.js:26:10)
    at /some_project/gitlab-pages/website/node_modules/docusaurus/lib/server/server.js:286:10
    at Layer.handle [as handle_request] (/some_project/gitlab-pages/website/node_modules/express/lib/router/layer.js:95:5)
    at next (/some_project/gitlab-pages/website/node_modules/express/lib/router/route.js:137:13)

server.js grabs an incorrect path:

      // copy into docusaurus so require paths work
      const userFileParts = userFile.split(`pages${sep}`);
      let tempFile = join(__dirname, '..', 'pages', userFileParts[1]);
      tempFile = tempFile.replace(
        path.basename(file),
        `temp${path.basename(file)}`,
      );
      mkdirp.sync(path.dirname(tempFile));
      fs.copySync(userFile, tempFile);