fix: remove negative footer margin that was hiding content

The margin-top: -60px on .cv-footer was pulling the footer up too much,
hiding the GitHub link and other footer content.

Removed the negative margin - the reduced .cv-main bottom padding
(1rem instead of 3rem) already provides better spacing without hiding content.

Result:
- Footer content (GitHub, LinkedIn links) now visible
- Still has better spacing than before
- Zoom control at 100px bottom clears footer properly

static/css/main.css

@@ -1696,7 +1696,6 @@ a:focus {
     color: #ccc;
     padding: 20px 0;
     margin: 0;
-    margin-top: -60px; /* Move footer up to reduce space and clear zoom control */
     grid-column: 1 / -1; /* Span all columns */
 }