✨ feat: Prehistory of Ethereum

[raxhvl]

Wiki PR Checklist

closes #152

• [x] Background on peer to peer computing.
• [x] Introduction on bitcoin.
• [x] Early bitcoin apps and their limitation.
• [x] Introduction of Ethereum and its world computer.
  • [x] How Ethereum world computer compares to traditional computers.

• [x] Applications

  There are some typos in docs/wiki/CL/cl-clients.md. Let me know if you want me to fix them.