docs: fix critical UI issues in documentation

- Reduce excessive header sizes (H1: 2.2rem, H2: 1.8rem)
- Improve dark mode link visibility with brighter blue
- Add better sidebar navigation spacing
- Reduce excessive list indentation

Fixes #258

Signed-off-by: Gyan Ranjan Panda <gyanranjanpanda@gmail.com>

Author: Gyan Ranjan Panda

docs/source/_static/theme_overrides.css

@@ -24,3 +24,30 @@ div.rst-content {
         margin-left: 0px;
     }
 }
+
+/* Minimal UI fixes */
+
+/* Fix 1: Reduce excessive header sizes */
+.rst-content h1 {
+    font-size: 2.2rem;
+}
+
+.rst-content h2 {
+    font-size: 1.8rem;
+}
+
+/* Fix 2: Improve dark mode link visibility */
+[data-theme="dark"] .rst-content a {
+    color: #5ca8ff;
+}
+
+/* Fix 3: Better sidebar navigation spacing */
+.wy-menu-vertical li a {
+    padding: 0.6em 1.2em;
+}
+
+/* Fix 4: Reduce list indentation */
+.rst-content ul,
+.rst-content ol {
+    margin-left: 1.5rem;
+}