Update lammps.book

Packages_user.html

Packages_details.html

Speed.html

Speed_bench.html

Speed_measure.html

Speed_tips.html

Speed_packages.html

Speed_gpu.html

Speed_intel.html

Speed_kokkos.html

Speed_omp.html

Speed_opt.html

Speed_compare

Section_howto.html

Examples.html

Section_perf.html

Tools.html

Modify.html

Modify_overview.html