The internal link in ox-html is a little fuzzy. For example, [[./test.org][test]] will be generated as <a href="file:///./test.jpg">"test" because the path is considered as an absolute file path.

In order to correctly generate internal link urls, you may write [[int-url:./test][test], JUST THE FILENAME WITHOUT THE .org EXTENSION PART and then it should be generated as <a href="./test/index.html">"test".

This is just a slightly adapted copy if the img-url solution for image url's

1. Change link prefix from 'int-url' to 'internal'. 2. Replace 'path' with a substring method that removes the .org extension in from the original org source file syntax to make the 'internal link' export function work similar as the 'img-url' export function, and also to keep the differences between a nikola org source file minimal with the original org source file.

update link prefix from 'int-url' to 'internal'. Remove reuirement to leave out .org extension in link (this is removed by a substring method in the init.el file)