docs: update README screenshots with backtest lab
- Rename img.png to backtest-lab.png - Arrange 12 screenshots in 6 pairs (2 per row) - Add Backtest Lab to Web Interface Features section
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Before Width: | Height: | Size: 409 KiB After Width: | Height: | Size: 1.6 MiB |
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Before Width: | Height: | Size: 359 KiB After Width: | Height: | Size: 1.6 MiB |