Delete useless codes in SIAB directory

tools/README.md

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+SIAB: codes to generate numerical atomic orbitals.
+molden: generate molden style file for Multiwfn analysis. 
+
+plot-tools: band structure, dos and pdos, dipole and adsorption.
+rt-tddft-tools: tools for real-time tddft.
+average_pot: python script used to calculate and plot the average electrostatic potential.
+stm: generate figures related to Scanning tunneling microscope technique.
+
+generate_orbital.sh: script used to generate numerical atomic orbitals (NAO).
+opt_abfs_bash: related to generating NAO basis set.
+opt_lcao_bash: related to generating NAO basis set.
+opt_orb_pytorch: related to generating NAO basis set.
+opt_orb_pytorch_dpsi: related to generating NAO basis set.
+qo: generate quasiatomic orbital (qo).