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There's a preset in Godot for pixel art

I think you know most of this but being super detailed for anyone else:

1. After importing your image, click on it in the resource list (in the bottom left part of the screen)
2. On the top left choose the Import tab (it's right next to the Scene tab)
3. Click on "Preset"
4. Choose "2D Pixel"
5. Click "Reimport"
6. The image should no longer be blurry
7. ???
8. Profit!