UI changes

build.cmd

@@ -13,6 +13,8 @@ setlocal
 call 3rd_party\CEF\create.cmd %TARGET_MODE%
 endlocal
 
+rd /s /q "%ROOT%dist\%TARGET_MODE%\htdocs"
+
 mkdir build >NUL 2>&1
 mkdir build\%TARGET_MODE% >NUL 2>&1
 pushd build\%TARGET_MODE% >NUL 2>&1