add designed layout

src/components/layout/Footer.svelte

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+<footer class="footer">
+    <img class="footer__illu" src="{ eldritchSky }" alt="">
+    <div>by Eldritch Café - <a href="https://github.com/EldritchCafe/radio" target="_blank">source code</a></div>
+</footer>
+
+<script>
+    import eldritchSky from '/assets/img/eldritch-sky.svg'
+</script>

src/components/layout/Header.svelte

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+<header class="header">
+    <div class="header__side">
+        <button class="header__sideBtn">About</button>
+    </div>
+    <h1 class="header__title">
+        <img src="{ logo }" alt="Eldritch Radio">
+    </h1>
+    <div class="header__side txtright">
+        <button class="header__sideBtn">Settings</button>
+    </div>
+</header>
+
+<script>
+    import logo from '/assets/img/logo.svg'
+</script>