Load all WordPress categories from the given site.

        :param max_pages: kill counter to avoid infinite looping
        :return: None

def load_categories(self, max_pages=30):
        """
        Load all WordPress categories from the given site.

        :param max_pages: kill counter to avoid infinite looping
        :return: None
        """
        logger.info("loading categories")

        # clear them all out so we don't get dupes if requested
        if self.purge_first:
            Category.objects.filter(site_id=self.site_id).delete()

        path = "sites/{}/categories".format(self.site_id)
        params = {"number": 100}
        page = 1

        response = self.get(path, params)

        if not response.ok:
            logger.warning("Response NOT OK! status_code=%s\n%s", response.status_code, response.text)

        while response.ok and response.text and page < max_pages:
            logger.info(" - page: %d", page)

            api_categories = response.json().get("categories")
            if not api_categories:
                # we're done here
                break

            categories = []
            for api_category in api_categories:

                # if it exists locally, update local version if anything has changed
                existing_category = Category.objects.filter(site_id=self.site_id, wp_id=api_category["ID"]).first()
                if existing_category:
                    self.update_existing_category(existing_category, api_category)
                else:
                    categories.append(self.get_new_category(api_category))

            if categories:
                Category.objects.bulk_create(categories)
            elif not self.full:
                # we're done here
                break

            # get next page
            page += 1
            params["page"] = page
            response = self.get(path, params)

            if not response.ok:
                logger.warning("Response NOT OK! status_code=%s\n%s", response.status_code, response.text)
                return