feat: First attempt of smaller temperature range

IDEC-462

mapfile/template.j2

@@ -200,9 +200,9 @@ LAYER
     CLASSITEM "[pixel]"
     CLASS
       NAME "Temperature range"
-      EXPRESSION ([pixel] >= -40 AND [pixel] <= 40)
+      EXPRESSION ([pixel] >= 10  AND [pixel] <= 25)
       STYLE
-        DATARANGE -40 40
+        DATARANGE 10 25
         COLORRANGE 255 255 0 0 0 255
       END
     END