Add Aternos.org logos

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📝 About your SVG:

• Title: Aternos logo
• Category: Hosting, Software
• Website URL: https://aternos.org
• Description: World's largest Minecraft server provider

📷 Screenshots:

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✅ Checklist

• [x] I have permission to use this logo.
• [x] The .svg file is optimized for web use.
• [x] The .svg size is less than 20kb.