Remove Trunk, Branches and Tags chapters from Tcar-fs.
    
    Previous to this commit, the texinfo documentation models for Tcar-fs
    documentation manual were organized using Trunk, Branches and Tags as
    chapters and all directories inside it as sections. This was fine for
    a conventional trunk, branches, tags layout. But it isn't for a Git
    layout where such structure isn't required.
    
    In this commit, I remove the Trunk, Branches and Tags chapters and
    start using Identity/ and Scripts/ as chapters instead. This to
    reflect the same structure provided by Git. The Locales/ and
    Documentation/ directories hadn't information at time of this commit
    so I didn't added now.