[ImgBot] Optimize images (#327)

*Total -- 1,666.89kb -> 1,490.41kb (10.59%)

/streamerbot/2.guide/assets/custom-triggers-nested.png -- 19.86kb -> 7.85kb (60.49%)
/streamerbot/2.guide/assets/keyboard-shortcuts/speech-commands.png -- 20.93kb -> 12.63kb (39.66%)
/streamerbot/2.guide/assets/keyboard-shortcuts/commands-tab.png -- 23.27kb -> 14.05kb (39.62%)
/streamerbot/2.guide/assets/keyboard-shortcuts/actions-tab.png -- 28.12kb -> 17.04kb (39.43%)
/streamerbot/2.guide/assets/keyboard-shortcuts/triggers-area.png -- 28.19kb -> 17.09kb (39.37%)
/streamerbot/2.guide/assets/keyboard-shortcuts/quotes-area.png -- 30.29kb -> 18.37kb (39.36%)
/streamerbot/2.guide/assets/keyboard-shortcuts/actions-area.png -- 27.97kb -> 17.06kb (39%)
/streamerbot/2.guide/assets/keyboard-shortcuts/midi-tab.png -- 21.52kb -> 13.14kb (38.93%)
/streamerbot/2.guide/assets/keyboard-shortcuts/sub-actions-area.png -- 27.91kb -> 17.07kb (38.85%)
/streamerbot/2.guide/assets/keyboard-shortcuts/midi-in-devices.png -- 21.49kb -> 13.19kb (38.65%)
/streamerbot/2.guide/assets/keyboard-shortcuts/midi-in-events.png -- 21.48kb -> 13.19kb (38.6%)
/streamerbot/2.guide/assets/keyboard-shortcuts/timed-actions-tab.png -- 22.98kb -> 14.23kb (38.09%)
/streamerbot/2.guide/assets/keyboard-shortcuts/midi-out-devices.png -- 21.29kb -> 13.34kb (37.34%)
/streamerbot/2.guide/assets/keyboard-shortcuts/twitch-rewards-tab.png -- 28.51kb -> 17.87kb (37.33%)
/streamerbot/2.guide/assets/keyboard-shortcuts/hot-keys-area.png -- 22.95kb -> 14.47kb (36.96%)
/streamerbot/3.api/1.sub-actions/elgato/wave-link/assets/set-output-volume.png -- 18.51kb -> 15.72kb (15.07%)
/streamerbot/3.api/1.sub-actions/elgato/wave-link/assets/mute-output.png -- 14.99kb -> 12.79kb (14.67%)
/streamerbot/3.api/1.sub-actions/elgato/wave-link/assets/set-output-monitor-device.png -- 19.55kb -> 16.72kb (14.49%)
/streamerbot/3.api/1.sub-actions/elgato/wave-link/assets/set-input-volume.png -- 19.62kb -> 16.81kb (14.35%)
/streamerbot/3.api/1.sub-actions/elgato/wave-link/assets/set-filter-state.png -- 24.56kb -> 21.05kb (14.26%)
/streamerbot/3.api/1.sub-actions/elgato/wave-link/assets/mute-input.png -- 18.22kb -> 15.65kb (14.09%)
/streamerbot/3.api/1.sub-actions/elgato/wave-link/assets/set-filter-bypass-state.png -- 19.43kb -> 16.70kb (14.06%)
/streamerbot/3.api/1.sub-actions/elgato/wave-link/assets/get-input-information.png -- 11.25kb -> 9.73kb (13.51%)
/streamerbot/3.api/1.sub-actions/elgato/wave-link/assets/get-filter-state.png -- 16.04kb -> 13.92kb (13.19%)
/streamerbot/2.guide/23.extra-features/assets/chat-overlay.gif -- 1,137.93kb -> 1,130.74kb (0.63%)

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