Refactors site to use interactive terminal UI

Moves site from static HTML to a dynamic terminal interface.

This commit represents a major overhaul, introducing:
- A functional terminal emulator implemented in JavaScript.
- Command parsing and execution framework.
- Various terminal commands for navigation and utility functions.
- SASS conversion.

The old CSS and simple HTML are completely removed. A new Hugo theme is implemented.

assets/js/init.js

@@ -0,0 +1,16 @@
+// Terminal Initialization Script
+// This script creates the terminal instance immediately
+// so command modules can register commands
+
+// Create global terminal instance immediately
+window.terminal = new TerminalShell();
+
+// Boot the terminal when DOM is ready
+if (document.readyState === "loading") {
+  document.addEventListener("DOMContentLoaded", () => {
+    terminal.boot();
+  });
+} else {
+  // DOM already loaded
+  terminal.boot();
+}