chore: fix build uses wrong sitemap template
chore: fix build uses wrong sitemap template

Our sitemap module was executed once, then the original Jekyll-sitemap module is executed and it overwrites our output. The fix is to override their method that chooses the template to point to our template. Also, this will now pass only once.
telerik/ajax-docs,telerik/ajax-docs,telerik/ajax-docs,telerik/ajax-docs