Improve search results with underscore and dash/hyphen package names (#649)

* Create underscore & dash separated variants for wildcard search

* frontend: simplify list uniqueness

---------

Co-authored-by: Naïm Favier <n@monade.li>

frontend/src/Search.elm

@@ -1240,6 +1240,11 @@ searchFields query mainField fields =
                     )
                 |> List.concat
 
+        queryWordsWildCard =
+            (String.replace "_" "-" query :: String.replace "-" "_" query :: queryWords)
+                |> Set.fromList
+                |> Set.toList
+
         queryWords =
             String.words (String.toLower query)
     in
@@ -1271,7 +1276,7 @@ searchFields query mainField fields =
                   )
                 ]
             )
-            queryWords
+            queryWordsWildCard
         )