[ERGO] doc rating star ergonomy

src/Gargantext/Components/Category.purs

@@ -71,9 +71,8 @@ ratingCpt = R.hooksComponentWithModule thisModule "rating" cpt
                                   else "fa fa-star"
 
           onClick score c = \_-> do
-            let c' = if score == Star_0 
-                       && c == Star_0
-                     then Star_1
+            let c' = if score == c
+                      then clickAgain c
                       else c
 
             setLocalCategories $ Map.insert r._id c'

src/Gargantext/Components/Category/Types.purs

@@ -41,6 +41,12 @@ star2score Star_2 = 2
 star2score Star_3 = 3
 star2score Star_4 = 4
 
+
+clickAgain :: Star -> Star
+clickAgain Star_0 = Star_1
+clickAgain s      = decodeStar (star2score s - 1)
+
+
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