Options to switch smolrss themes

src/freedombone-app-smolrss

 function configure_interactive_smolrss {
     W=(1 $"Add an RSS feed"
        2 $"Remove an RSS feed"
-       3 $'Edit all feeds')
+       3 $'Edit all feeds'
+       4 $'Light theme'
+       5 $'Dark theme')
 
     read_config_param SMOLRSS_DOMAIN_NAME
 
     while true
     do
+
         # shellcheck disable=SC2068
-        selection=$(dialog --backtitle $"Freedombone Administrator Control Panel" --title $"Smol RSS" --menu $"Choose an operation, or ESC for main menu:" 12 70 3 "${W[@]}" 3>&2 2>&1 1>&3)
+        selection=$(dialog --backtitle $"Freedombone Administrator Control Panel" --title $"Smol RSS" --menu $"Choose an operation, or ESC for main menu:" 14 70 5 "${W[@]}" 3>&2 2>&1 1>&3)
 
         if [ ! "$selection" ]; then
             break
                ./create_feeds feeds.txt > feeds.xml
                chown www-data:www-data feeds.txt
                ;;
+            4) cd "/var/www/$SMOLRSS_DOMAIN_NAME/htdocs" || break
+               cp style.light.css style.css
+               chown www-data:www-data style.css
+               dialog --title $"Smol RSS theme" \
+                      --msgbox $"Switched theme to light" 6 50
+               ;;
+            5) cd "/var/www/$SMOLRSS_DOMAIN_NAME/htdocs" || break
+               cp style.dark.css style.css
+               chown www-data:www-data style.css
+               dialog --title $"Smol RSS theme" \
+                      --msgbox $"Switched theme to dark" 6 50
+               ;;
         esac
     done
 }