Remove echo command from Dockerfile

Removed unnecessary echo command from Dockerfile.

Author: YWHyuk

tutorial/jupyterhub/Dockerfile.ksc2025

@@ -80,8 +80,6 @@ RUN git clone https://github.com/riscv-software-src/riscv-pk.git && \
 RUN apt install ninja-build && pip install onnx matplotlib && pip install --user conan==1.56.0
 
 # Prepare PyTorchSim project
-RUN echo "Remove me!"
-
 RUN git clone https://github.com/PSAL-POSTECH/PyTorchSim.git --branch tutorial
 RUN cd PyTorchSim/TOGSim && \
     git submodule update --recursive --init && \