add(Header): social links: github and mail links

src/widget/Header.zig

@@ -61,7 +61,22 @@ fn fillView(this: *@This()) void {
         }
     }
 
-    // TODO: github icon, discord icon, mail icon with corresponding links to contact me
+    // github
+    {
+        const cell: vaxis.Cell = .{
+            .link = .{ .uri = "https://github.com/yves-biener" },
+            .char = .{ .grapheme = "github" },
+        };
+        this.view.?.writeCell(this.view.?.screen.width - 9, 0, cell);
+    }
+    // mail
+    {
+        const cell: vaxis.Cell = .{
+            .link = .{ .uri = "mailto:yves.biener@gmx.de" },
+            .char = .{ .grapheme = "mail" },
+        };
+        this.view.?.writeCell(this.view.?.screen.width - 16, 0, cell);
+    }
 }
 
 /// Update loop for a given widget to react to the provided `Event`. It may