GitLab

* changes to functionality and/or problem solved:

    instances of triple backticks '```' to render verbatim blocks in
    markdown files have been replaced with indentation. Imrpoves
    readability of raw files and rendering in some viewers.

    Additionally, the broken link to the mainpage for the doxygen
    (`/docs/ABOUT.md`) has been fixed in `/docs/Doxyfile`.

* subroutines affected:

    none

* dependencies:

    none

* changes to required input:

    none

* status:

    closed