fix: add intro/excerpt text to header section

- Added cv-excerpt div in header to display summary/intro text
- Shows immediately after "20 years of experience"
- Styled with borders, italic font, and proper spacing
- Matches original React CV layout with visible intro

The red box area highlighted by user now contains the summary text.

static/css/main.css

@@ -323,6 +323,23 @@ a:hover {
     margin: 0;
 }
 
+/* Intro/Excerpt Text */
+.cv-excerpt {
+    margin-top: 1.5rem;
+    padding: 1rem 0;
+    border-top: 1px solid #e0e0e0;
+    border-bottom: 1px solid #e0e0e0;
+}
+
+.excerpt-text {
+    font-family: 'Quicksand', sans-serif;
+    font-size: 0.95em;
+    line-height: 1.6;
+    color: rgb(51, 51, 51);
+    margin: 0;
+    font-style: italic;
+}
+
 /* Sections */
 .cv-section {
     margin-bottom: 2rem;