Update index.html

[CodeMaverick-143]

The code applies a CMATRIX-like theme to a webpage, featuring a black background and neon-green text for a terminal-style look. It uses monospaced fonts and matrix-inspired animations, making elements flicker subtly. Key sections, like headers and code blocks, are emphasized with glowing green accents, borders, and shadows. The page is designed to resemble the classic matrix effect, with structured lists and code blocks for clear presentation of information and instructions.