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/commands/core.js

@@ -0,0 +1,41 @@
+// Core Commands Module
+// These are essential commands for the terminal
+
+// Help command
+window.terminal.registerCommand("help", "Display available commands", () => {
+  window.terminal.print("Available commands:", "success");
+  window.terminal.print("");
+
+  const commands = Object.keys(window.terminal.commands).sort();
+  commands.forEach((cmd) => {
+    const desc = window.terminal.commands[cmd].description || "No description";
+    window.terminal.print(`  ${cmd.padEnd(15)} - ${desc}`);
+  });
+  window.terminal.print("");
+});
+
+// Clear command
+window.terminal.registerCommand("clear", "Clear the terminal screen", () => {
+  window.terminal.clear();
+});
+
+// Echo command
+window.terminal.registerCommand("echo", "Echo text to the terminal", (args) => {
+  window.terminal.print(args.join(" "));
+});
+
+// History command
+window.terminal.registerCommand("history", "Show command history", () => {
+  if (window.terminal.history.length === 0) {
+    window.terminal.print("No commands in history");
+    return;
+  }
+
+  window.terminal.print("Command history:", "info");
+  window.terminal.history
+    .slice()
+    .reverse()
+    .forEach((cmd, idx) => {
+      window.terminal.print(`  ${idx + 1}. ${cmd}`);
+    });
+});