remove subtree

sha-2-accelerator/.DS_Store

sha-2-accelerator/.gitignore

sha-2-accelerator/.vscode/settings.json

sha-2-accelerator/README.md

sha-2-accelerator/flist/sha-2-accelerator_src.flist

sha-2-accelerator/flow/lint

sha-2-accelerator/flow/simulators/ivlog_sim.sh

sha-2-accelerator/flow/socsim

sha-2-accelerator/flow/socsim_py

sha-2-accelerator/flow/socsim_py.py

sha-2-accelerator/hdl/registers/config.yml

sha-2-accelerator/hdl/registers/out/status_regs.h

sha-2-accelerator/hdl/registers/out/status_regs.md

sha-2-accelerator/hdl/registers/out/status_regs.sv

sha-2-accelerator/hdl/registers/out/status_regs_ral_pkg.sv

sha-2-accelerator/hdl/registers/out/status_regs_rtl_pkg.sv

sha-2-accelerator/hdl/registers/status_regs.yml

sha-2-accelerator/hdl/src/fifo_vr.sv

sha-2-accelerator/hdl/src/sha256_1_3_arbitrator.sv

sha-2-accelerator/hdl/src/sha256_config_sync.sv