Refactor: rename SimDUT, restructure DUT simulation and test flow

docs/_static/custom.css

@@ -0,0 +1,43 @@
+/* custom.css: Modernized Sphinx Theme Tweaks */
+
+body {
+    font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
+    line-height: 1.6;
+    background-color: #fefefe;
+    color: #333;
+    max-width: 1000px;
+    margin: auto;
+    padding: 2em;
+}
+
+h1, h2, h3, h4 {
+    color: #005f73;
+}
+
+a {
+    color: #0a9396;
+    text-decoration: none;
+}
+
+a:hover {
+    text-decoration: underline;
+}
+
+code, pre {
+    background-color: #f0f0f0;
+    padding: 0.2em 0.4em;
+    border-radius: 4px;
+    font-family: Consolas, monospace;
+    color: #1e1e1e;
+}
+
+.rst-content table.docutils {
+    border-collapse: collapse;
+    border: 1px solid #ccc;
+}
+
+.rst-content table.docutils th,
+.rst-content table.docutils td {
+    border: 1px solid #ccc;
+    padding: 6px 12px;
+}