Remove unused theme-toggle partial and clean up about page

layouts/_partials/theme-toggle.html

@@ -1,25 +0,0 @@
-{{- $iconHeight := .iconHeight | default 20 -}} {{- $class := .class | default
-"hx:p-2" -}}
-
-<button
-    type="button"
-    aria-label="Toggle theme"
-    class="hx:cursor-pointer hx:rounded-md hx:hover:bg-gray-100 hx:dark:hover:bg-neutral-800 hx:transition-colors {{ $class }}"
-    onclick="
-        (function () {
-            var h = document.documentElement;
-            var n = h.classList.contains('dark') ? 'light' : 'dark';
-            setTheme(n);
-            localStorage.setItem('color-theme', n);
-        })()
-    "
->
-    <span class="theme-toggle-dark">
-        {{- partial "utils/icon.html" (dict "name" "sun" "attributes" (printf
-        `height=%d` $iconHeight)) -}}
-    </span>
-    <span class="theme-toggle-light">
-        {{- partial "utils/icon.html" (dict "name" "moon" "attributes" (printf
-        `height=%d` $iconHeight)) -}}
-    </span>
-</button>