Rename `Directories' directory to `Chapters' inside template files
    used to build manuals in texinfo format:
    
        - Previously, the `Directories' directory contained the files used
          to build the `Directories' chapter inside manuals written in
          texinfo format. This chapter existed to hold documentation
          entries for each directory in the working copy.
    
        - Presently, the `Directories' directory is no longer attached to
          this purpose since chapters and sections can be created
          dynamically through centos-art.sh command-line. 
    
        - Previously, it was required that each manual written in texinfo
          had a `Directories' chapter inside.
    
        - Presently, the restriction of using `Directories' chapter inside
          manuals written in texinfo format is no longer imposed.