fix(Docs): Improve installation process and update documentation

[almostintuitive]

Summary

This PR improves the installation script to properly install the binary to a system directory and updates documentation to reflect correct symbol naming conventions.

Key Changes

Installation Script (install.sh):

• Use temporary file during download to avoid leaving incomplete binaries in the current directory
• Install binary to /usr/local/bin instead of current directory, making it globally accessible
• Automatically use sudo when necessary if the installation directory is not writable
• Update completion message to reflect that the binary is now available as a global command

Documentation (README.md):

• Update perpetual futures symbol format from BTC-USDT-PERP to perpetual-BTC-USDT:USDT across all examples (ohlcv, flow, and basis commands)
• Ensures documentation matches the actual symbol naming convention used by the application

Implementation Details

• The installation now uses mktemp to create a temporary file for the download, which is then moved to the final location
• Proper error handling ensures the temporary file is cleaned up if the download fails
• The script intelligently handles permission issues by attempting a direct move first, then falling back to sudo if needed
• Users can now run aperiodic directly from any directory after installation, rather than needing to reference it with ./

https://claude.ai/code/session_01KriqNVbEfa4zvw9xAh8nj5