Update lammps.book

doc/src/lammps.book

 #HTMLDOC 1.8.28
 -t pdf14 -f "../Manual.pdf" --book --toclevels 4 --no-numbered --toctitle "Table of Contents" --title --textcolor #000000 --linkcolor #0000ff --linkstyle plain --bodycolor #ffffff --size Universal --left 1.00in --right 0.50in --top 0.50in --bottom 0.50in --header .t. --header1 ... --footer ..1 --nup 1 --tocheader .t. --tocfooter ..i --portrait --color --no-pscommands --no-xrxcomments --compression=9 --jpeg=0 --fontsize 11.0 --fontspacing 1.2 --headingfont Sans --bodyfont Serif --headfootsize 11.0 --headfootfont Sans-Bold --charset iso-8859-15 --links --embedfonts --pagemode document --pagelayout single --firstpage c1 --pageeffect none --pageduration 10 --effectduration 1.0 --no-encryption --permissions all  --owner-password ""  --user-password "" --browserwidth 680 --no-strict --no-overflow
 Manual.html
-Section_intro.html
+Intro.html
+Intro_overview.html
+Intro_features.html
+Intro_nonfeatures.html
+Intro_opensource.html
+Intro_authors.html
+Intro_website.html
 Section_start.html
 Section_commands.html
 Packages.html
@@ -19,7 +25,43 @@ Speed_kokkos.html
 Speed_omp.html
 Speed_opt.html
 Speed_compare.html
-Section_howto.html
+Howto.html
+Howto_github.html
+Howto_pylammps.html
+Howto_bash.html
+Howto_restart.html
+Howto_viz.html
+Howto_multiple.html
+Howto_replica.html
+Howto_library.html
+Howto_couple.html
+Howto_output.html
+Howto_chunk.html
+Howto_2d.html
+Howto_triclinic.html
+Howto_walls.html
+Howto_nemd.html
+Howto_granular.html
+Howto_spherical.html
+Howto_dispersion.html
+Howto_temperature.html
+Howto_thermostat.html
+Howto_barostat.html
+Howto_elastic.html
+Howto_kappa.html
+Howto_viscosity.html
+Howto_diffusion.html
+Howto_bioFF.html
+Howto_tip3p.html
+Howto_tip4p.html
+Howto_spc.html
+Howto_body.html
+Howto_polarizable.html
+Howto_coreshell.html
+Howto_drude.html
+Howto_drude2.html
+Howto_manifold.html
+Howto_spins.html
 Examples.html
 Tools.html
 Modify.html
@@ -54,13 +96,6 @@ Errors_common.html
 Errors_bugs.html
 Errors_messages.html
 Errors_warnings.html
-Section_history.html
-
-lammps_tutorials.html
-tutorial_bash_on_windows.html
-tutorial_drude.html
-tutorial_github.html
-tutorial_pylammps.html
 
 lammps_support.html
 body.html