Sitemap: Exclude categories with "noindex" by default

This feature request aims to automate the validity of the topics sitemap by including or excluding specific URL based on website indexing rules at post/topic level or category level.

The idea is simple:

• All URLs with a 200 HTTP status code are included in the sitemap by default. (Already live)
• directories for categories and pages that have been set to noindex should be automatically excluded
• The sitemap is automatically generated and updated whenever there is a change in URLs, robots meta tags