LaTeX Script v1.4

This release splits the original script into three parts: a theoretical introduction to LaTeX, a set of exercises, and a document containing the respective solutions. We did so to reduce compile time and overall complexity. Moreover, we changed the order of the chapters to spend more time on reference management. Code listings are now the last feature to be introduced. Some bugs with the exercises and solutions were solved, particularly regarding labels and captions for listings and general listing configuration.