chore: Improve website.

[cpojer]

Another pass on the homepage:

• Fix a visual bug in the feature columns
• Use × instead of x for performance comparisons
• Updated the headline back to the original, didn't like the new version
• Swapped "test" with "check" in the vertical list. The intention is to have the development loop in order from "top to bottom"
• Added install instructions + copy button

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