Add about panel in settings dialog (#799)

* basic about page

* Remove frontend version from setting dialog header

* Style about page

* basic system stats

* Basic styling

* Reword

* Format memory amount

src/components/dialog/header/SettingDialogHeader.vue

@@ -3,16 +3,10 @@
     <h2>
       <i class="pi pi-cog"></i>
       <span>{{ $t('settings') }}</span>
-      <Tag :value="frontendVersion" severity="secondary" class="version-tag" />
     </h2>
   </div>
 </template>
 
-<script setup lang="ts">
-import Tag from 'primevue/tag'
-const frontendVersion = 'v' + window['__COMFYUI_FRONTEND_VERSION__']
-</script>
-
 <style scoped>
 .pi-cog {
   font-size: 1.25rem;