ExpressionEngineV2 Return category name, id, url-title from a url segment or a query string
Example: http://example.com/category-url-title
{exp:cat_url:category_id segment="2"}
Example: http://example.com/category-url-title
{exp:cat_url:category_name segment="2"}
Example: http://example.com?cat=my-category
{exp:cat_url:query_string query="my-category"}