A good place to to post such sites is the Fortran Wiki, which anyone can edit. The “Programming in Modern Fortran” link you posted is already on the tutorials page.
Thanks for the info about FortranWiki, which is also very useful (I consulted it many times). But if possible, I would like to use newer sites like this… (which is easy to post/edit and feel more accessible to me). I thought it may be better to directly post “issues” or something for Github pages like below, but was not sure which page I should use… https://fortran-lang.org/packages/