Fix download version 0.8.3 → 0.8.2

Korrigiert die fälschlich als 0.8.3 ausgewiesene Aktuell-Version
auf 0.8.2 in Hero, Downloads, FAQ, Changelog und Auto-Updater-Endpoint.
Changelog-Patch-Range entsprechend auf 0.8.0–0.8.1 angepasst.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

public/js/main-head.js

@@ -1,22 +0,0 @@
-// The section must not be in the banner.js (body) file because it can create a quick flash.
-
-if (localStorage.getItem('banner-closed')) {
-  document.documentElement.style.setProperty("--hextra-banner-height", "0px");
-  document.documentElement.classList.add("hextra-banner-hidden");
-}
-
-;
-// The section must not be in the theme.js (body) file because it can create a quick flash (switch between light and dark).
-
-function setTheme(theme) {
-  document.documentElement.classList.remove("light", "dark");
-
-  if (theme !== "light" && theme !== "dark") {
-    theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light";
-  }
-
-  document.documentElement.classList.add(theme);
-  document.documentElement.style.colorScheme = theme;
-}
-
-setTheme("color-theme" in localStorage ? localStorage.getItem("color-theme") : 'light')