feat: add footer component

- add lucide svelte icon library
- add footer section to data.json
- add footer types
- add css variables
- update header position mobile

src/lib/styles/app.css

@@ -1,8 +1,13 @@
 :root {
     --color-body-background: oklch(0.21 0.034 264.665);
+    --color-footer-background: oklch(0.13 0.028 261.692);
+
     --color-header-border: oklab(0.623 -0.0378409 -0.210628 / 0.3);
     --color-dark-blue: oklab(0.21 -0.00316128 -0.0338527 / 0.95);
+
     --color-text-primary: oklch(0.872 0.01 258.338);
+    --color-text-secondary: oklch(0.551 0.027 264.364);
+
     --color-accent-primary: oklch(70.7% 0.165 254.624);
     --color-accent-secondary:oklch(0.585 0.233 277.117);