docs: public String readFileContent(String filename) throws CmsException {
  
          filename = CmsLinkManager.getAbsoluteUri(
              filename,
              CmsResource.getFolderPath(m_cms.getRequestContext().getUri()));
          CmsFile file = m_cms.readFile(filename, CmsResourceFilter.IGNORE_EXPIRATION);
          return new String(file.getContents());
      }