feat(layout): add footer component and centralize imports in Landing layout

src/components/layout/parts/Footer.astro

@@ -0,0 +1,25 @@
+---
+import { css } from '@styled-system/css'
+
+const footerLegendClass = css({
+  paddingBlock: 'md',
+  textAlign: 'center',
+  fontSize: 'sm'
+})
+const footerLegendHeartClass = css({
+  color: 'red'
+})
+---
+
+<footer>
+  <p class={footerLegendClass}>
+    Hecho con
+    <span class={footerLegendHeartClass}
+      ><i class="fa-solid fa-heart"></i></span
+    >
+    y
+    <a href="https://astro.build">Astro</a>
+    por
+    <a href="https://srjuggernaut.dev">Jugger</a>.
+  </p>
+</footer>