Add link to Drupal 11 documentation

Problem/Motivation

The project page "Resources" block links to Drupal 7 documentation. Also, the "Read log of changes" link is dead.

Resources

• Home page
• Read license
• Read log of changes
• https://www.drupal.org/handbook/modules/xmlsitemap →
• View project translations
• Projects that extend this →

Steps to reproduce

Proposed resolution

1. Remove the dead "Read log of changes" link
2. Update link text for old docs to D7 XML sitemap docs →
3. Add link to Drupal 11 documentation: XML sitemap documentation →

Remaining tasks

User interface changes

API changes

Data model changes