Remove favicon.svg and update layout assets

Use absolute path for unscii-16 preload and remove unscii-8 preload.
Replace file favicon.svg with inline SVG data-URI favicon, using text emoji and coloring it lime
green.
For the footer, remove the current year copyright and replace with Creative Commons icons for
CC-BY-NC-SA license. Move the theme
x-data and parallax choosing logic from BaseLayout to parallax.astro

src/pages/parallax.astro

@@ -131,7 +131,7 @@ import Layout from "@layouts/BaseLayout.astro";
     }
   </style>
   <Fragment slot="content">
-    <article id="hero">
+    <article id="hero" x-data="{ theme: 'winternight'}">
       <div class="parallax-container" :class="'parallax-theme-' + theme">
         <div class="layer layer-0"></div>
         <div class="layer layer-1"></div>