Idea: "Source File" link to GitHub

This is just a wish list idea I wanted to share...

Some static site generators have options to "view source" or "edit source". Even the FORD docs has an option to "Suggest edit"

In FORD, there is the default option to `incl_src` which copies the source code into pages like this...

### New idea
Given that a project exists in a remote repo (GitHub, GitHub enterprise server, Bitbucket, etc.), it would be handy to provide a link to source file where it is hosted rather than a FORD generated Source File page.

For example, FORD could link to a page like this...https://github.com/Fortran-FOSS-Programmers/ford/edit/master/test_data/ford_test_program.f90.