remove cstag for the example installation

Author: akikuno

README.md

@@ -33,7 +33,7 @@ conda install -c bioconda cstag-cli
 > To Apple Silicon (ARM64) users:  
 > [Since the Bioconda channel does not yet support Apple Silicon](https://github.com/bioconda/bioconda-recipes/issues/37068#issuecomment-1257790919), please use the following command to install `cstag-cli` through Rosetta.
 > ```bash
-> CONDA_SUBDIR=osx-64 conda create -n env-cstag -c conda-forge -c bioconda python=3.10 cstag cstag-cli -y
+> CONDA_SUBDIR=osx-64 conda create -n env-cstag -c conda-forge -c bioconda python=3.10 cstag-cli -y
 > conda activate env-cstag
 > conda config --env --set subdir osx-64
 > ```