chore : add Logo to Cairo Zero extension

[TAdev0]

• Add logo to Cairo Zero extension
• Rename extension to Cairo 0 (more consistent with the other "Cairo 1.0" extension)

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This change is 

[TAdev0]

@liorgold2 i'm working at Nethermind and was requested to add a Logo to Cairo zero extension

After merging, someone with rights for Starkware publisher will need to do vsce publish to update it in the VSC marketplace