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/sass/_normalize.scss

@@ -0,0 +1,255 @@
+/*! modern-normalize | MIT License | https://github.com/sindresorhus/modern-normalize */
+
+/* Document
+   ========================================================================== */
+
+/**
+ * Use a better box model (opinionated).
+ */
+
+ html {
+    box-sizing: border-box;
+  }
+  
+  * {
+    box-sizing: inherit;
+    &::before, &::after {
+      box-sizing: inherit;
+    }
+  }
+  
+  /**
+   * Use a more readable tab size (opinionated).
+   */
+  
+  :root {
+    -moz-tab-size: 4;
+    tab-size: 4;
+  }
+  
+  /**
+   * 1. Correct the line height in all browsers.
+   * 2. Prevent adjustments of font size after orientation changes in iOS.
+   */
+  
+  html {
+    line-height: 1.15;
+    /* 1 */
+    -webkit-text-size-adjust: 100%;
+    /* 2 */
+  }
+  
+  /* Sections
+     ========================================================================== */
+  
+  /**
+   * Remove the margin in all browsers.
+   */
+  
+  body {
+    margin: 0;
+    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol';
+  }
+  
+  /**
+   * Improve consistency of default fonts in all browsers. (https://github.com/sindresorhus/modern-normalize/issues/3)
+   */
+  
+  /* Grouping content
+     ========================================================================== */
+  
+  /**
+   * Add the correct height in Firefox.
+   */
+  
+  hr {
+    height: 0;
+  }
+  
+  /* Text-level semantics
+     ========================================================================== */
+  
+  /**
+   * Add the correct text decoration in Chrome, Edge, and Safari.
+   */
+  
+  abbr[title] {
+    text-decoration: underline dotted;
+  }
+  
+  /**
+   * Add the correct font weight in Chrome, Edge, and Safari.
+   */
+  
+  b, strong {
+    font-weight: bolder;
+  }
+  
+  /**
+   * 1. Improve consistency of default fonts in all browsers. (https://github.com/sindresorhus/modern-normalize/issues/3)
+   * 2. Correct the odd `em` font sizing in all browsers.
+   */
+  
+  code, kbd, samp, pre {
+    font-family: SFMono-Regular, Consolas, 'Liberation Mono', Menlo, Courier, monospace;
+    /* 1 */
+    font-size: 1em;
+    /* 2 */
+  }
+  
+  /**
+   * Add the correct font size in all browsers.
+   */
+  
+  small {
+    font-size: 80%;
+  }
+  
+  /**
+   * Prevent `sub` and `sup` elements from affecting the line height in all browsers.
+   */
+  
+  sub, sup {
+    font-size: 75%;
+    line-height: 0;
+    position: relative;
+    vertical-align: baseline;
+  }
+  
+  sub {
+    bottom: -0.25em;
+  }
+  
+  sup {
+    top: -0.5em;
+  }
+  
+  /* Forms
+     ========================================================================== */
+  
+  /**
+   * 1. Change the font styles in all browsers.
+   * 2. Remove the margin in Firefox and Safari.
+   */
+  
+  button, input, optgroup, select, textarea {
+    font-family: inherit;
+    /* 1 */
+    font-size: 100%;
+    /* 1 */
+    line-height: 1.15;
+    /* 1 */
+    margin: 0;
+    /* 2 */
+  }
+  
+  /**
+   * Remove the inheritance of text transform in Edge and Firefox.
+   * 1. Remove the inheritance of text transform in Firefox.
+   */
+  
+  button, select {
+    /* 1 */
+    text-transform: none;
+  }
+  
+  /**
+   * Correct the inability to style clickable types in iOS and Safari.
+   */
+  
+  button, [type='button'], [type='reset'], [type='submit'] {
+    -webkit-appearance: button;
+  }
+  
+  /**
+   * Remove the inner border and padding in Firefox.
+   */
+  
+  button::-moz-focus-inner, [type='button']::-moz-focus-inner, [type='reset']::-moz-focus-inner, [type='submit']::-moz-focus-inner {
+    border-style: none;
+    padding: 0;
+  }
+  
+  /**
+   * Restore the focus styles unset by the previous rule.
+   */
+  
+  button:-moz-focusring, [type='button']:-moz-focusring, [type='reset']:-moz-focusring, [type='submit']:-moz-focusring {
+    outline: 1px dotted ButtonText;
+  }
+  
+  /**
+   * Correct the padding in Firefox.
+   */
+  
+  fieldset {
+    padding: 0.35em 0.75em 0.625em;
+  }
+  
+  /**
+   * Remove the padding so developers are not caught out when they zero out `fieldset` elements in all browsers.
+   */
+  
+  legend {
+    padding: 0;
+  }
+  
+  /**
+   * Add the correct vertical alignment in Chrome and Firefox.
+   */
+  
+  progress {
+    vertical-align: baseline;
+  }
+  
+  /**
+   * Correct the cursor style of increment and decrement buttons in Safari.
+   */
+  
+  [type='number'] {
+    &::-webkit-inner-spin-button, &::-webkit-outer-spin-button {
+      height: auto;
+    }
+  }
+  
+  /**
+   * 1. Correct the odd appearance in Chrome and Safari.
+   * 2. Correct the outline style in Safari.
+   */
+  
+  [type='search'] {
+    -webkit-appearance: textfield;
+    /* 1 */
+    outline-offset: -2px;
+    /* 2 */
+    &::-webkit-search-decoration {
+      -webkit-appearance: none;
+    }
+  }
+  
+  /**
+   * Remove the inner padding in Chrome and Safari on macOS.
+   */
+  
+  /**
+   * 1. Correct the inability to style clickable types in iOS and Safari.
+   * 2. Change font properties to `inherit` in Safari.
+   */
+  
+  ::-webkit-file-upload-button {
+    -webkit-appearance: button;
+    /* 1 */
+    font: inherit;
+    /* 2 */
+  }
+  
+  /* Interactive
+     ========================================================================== */
+  
+  /*
+   * Add the correct display in Chrome and Safari.
+   */
+  
+  summary {
+    display: list-item;
+  }