Feature: Ground state projection tool for RT-TDDFT (#5477)

* Update README.md

* Ground state projection

* Delete tools/plot-tools/abacus_plot/dipole.py

* Delete tools/plot-tools/examples/N2 directory

* Add files via upload

* Delete tools/rt-tddft-tools/examples/ground-state-projection-Si/Excited_band_for_ik1.png

* Delete tools/rt-tddft-tools/examples/ground-state-projection-Si/On_0.dat

* Delete tools/rt-tddft-tools/examples/ground-state-projection-Si/On_1.dat

* Delete tools/rt-tddft-tools/examples/ground-state-projection-Si/Si_ONCV_PBE-1.0.upf

* Delete tools/rt-tddft-tools/examples/ground-state-projection-Si/Si_gga_8au_100Ry_2s2p1d.orb

* Add files via upload

* Delete tools/rt-tddft-tools/examples/ground-state-projection-Si/Excited_band_for_ik1.jpeg

* Delete tools/rt-tddft-tools/examples/Absorpation-N2/out_abs.png

* Delete tools/rt-tddft-tools/examples/Absorpation-N2/out_dipole.png

* Update overlap_generator.py

Author: ESROAMER

tools/plot-tools/README.md

@@ -147,27 +147,3 @@ Then, the following command will output parsed partial DOS to directory `PDOS_FI
 abacus-plot -d -o
 ```
 
-### Dipole and Absorption
-
-```python
-
-from abacus_plot.dipole import Dipole
-from abacus_plot.dipole import Absorption
-import matplotlib.pyplot as plt
-
-dipolefile = './SPIN1_DIPOLE'
-dipole = Dipole(dipolefile, dt=0.0024)
-Efile=[["efield_0.dat"],["efield_1.dat"],["efield_2.dat"]]
-#Efile is a 2D list, Efile[i][j] is the jth Efield data file in ith direction
-Abs = Absorption(dipolefile, Efile, dt=0.0024)
-
-fig1, ax1 = plt.subplots()
-fig1, ax1 = dipole.plot_dipole(fig1, ax1)
-fig1.savefig('dipole.png')
-
-fig2, ax2 = plt.subplots()
-x_range = [0, 20]
-fig2, ax2 = Abs.plot_abs(
-    fig2, ax2, x_range=x_range, unit='eV')
-fig2.savefig('abs.png')
-```