🚧 💄 Implement new settings menu and 3 subpages

- Implement new main settings menu
- Implement "filtering" page
- Implement "appearance" page
- Implement "about" page
- Make the Git hash a link to the Git repo

src/views/settings/AppearanceSettings.vue

@@ -0,0 +1,28 @@
+<script setup>
+import { theme } from "@/store";
+import RadioButtons from "@/components/settings/radio-buttons.vue";
+</script>
+
+<template>
+  <h2>{{ $t("settings.heading.theme") }}</h2>
+  <p>{{ $t("settings.text.theme") }}</p>
+  <RadioButtons
+    :options="[
+      $t('settings.theme.auto'),
+      $t('settings.theme.light'),
+      $t('settings.theme.dark'),
+    ]"
+    :values="['auto', 'light', 'dark']"
+    v-model="theme"
+  />
+</template>
+
+<style scoped>
+h2 {
+  margin: 0px;
+}
+
+p {
+  margin: 5px 0px;
+}
+</style>