Reduced CMake configuration in projects and improved build instructions

config/ext/Project.cmake

doc/BUILD_LINUX.md

doc/BUILD_WINDOWS.md

projects/CMakeLists.txt

projects/bindless_textures/CMakeLists.txt

projects/first_mesh/CMakeLists.txt

projects/first_scene/CMakeLists.txt

projects/first_triangle/CMakeLists.txt

projects/head_demo/CMakeLists.txt

projects/indirect_dispatch/CMakeLists.txt

projects/indirect_draw/CMakeLists.txt

projects/mesh_shader/CMakeLists.txt

projects/particle_simulation/CMakeLists.txt

projects/path_tracer/CMakeLists.txt

projects/rtx_ambient_occlusion/CMakeLists.txt

projects/saf_r/CMakeLists.txt

projects/sph/CMakeLists.txt

projects/voxelization/CMakeLists.txt

projects/wobble_bobble/CMakeLists.txt