Add vignettes pseudocode

[damianooldoni]

This PR:

• Updates README as the scope of this repo is not anymore to provide an R package with functions to read archival tags, but only to document the data files and how to parse them
• Improves the general vignette describing the general data file structures and information about each section
• Remove duplicate vignette (by renaming the vignette, there were two vignette containing the same info)