[ImgBot] Optimize images

*Total -- 144.69kb -> 76.40kb (47.2%)

/circuit_diagrams/04_simon.png -- 20.05kb -> 10.00kb (50.13%)
/circuit_diagrams/03_bernstein_vazirani.png -- 19.24kb -> 9.86kb (48.76%)
/circuit_diagrams/e1_superdense_coding.png -- 11.06kb -> 5.68kb (48.61%)
/circuit_diagrams/06_grovers_algorithm.png -- 22.27kb -> 11.54kb (48.17%)
/circuit_diagrams/e2_quantum_teleportation.png -- 19.53kb -> 10.15kb (48.02%)
/circuit_diagrams/e3_quantum_phase_estimation.png -- 15.01kb -> 7.96kb (46.94%)
/circuit_diagrams/05_qft.png -- 14.46kb -> 7.99kb (44.75%)
/circuit_diagrams/01_deutsch.png -- 9.13kb -> 5.10kb (44.12%)
/circuit_diagrams/02_deutsch_jozsa.png -- 13.95kb -> 8.11kb (41.87%)

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