add pppm/kk and fix reax/c issues

doc/html/Section_howto.html

doc/html/Section_intro.html

doc/html/Section_packages.html

doc/html/Section_start.html

doc/html/accelerate_kokkos.html

doc/html/body.html

doc/html/compute_damage_atom.html

doc/html/compute_dilatation_atom.html

doc/html/compute_erotate_rigid.html

doc/html/compute_plasticity_atom.html

doc/html/compute_reduce.html

doc/html/compute_temp_deform_eff.html

doc/html/compute_temp_eff.html

doc/html/dihedral_table.html

doc/html/dump.html

doc/html/dump_custom_vtk.html

doc/html/dump_image.html

doc/html/fix_ave_chunk.html

doc/html/fix_bond_create.html

doc/html/fix_deform.html