node anchors on single front page website
We created the Single Page Site module, to incorporate one page websites into Drupal. This is an example of a website using it: http://starfisk.com
Some more details about this module (from its project page), which is available for both D7 and D8:

This module provides functionality to create a single page website.
It allows you to automatically create a single page from a menu. The module will render all the content from the links, that are configured in the menu, on one page. It will then override the menu links so that they refer to an anchor instead of a new page.