Remove unnecessary spago.dhall

spago.dhall

-{ name = "gargantext"
-, dependencies =
-    [ "affjax"
-    , "argonaut"
-    , "console"
-    , "css"
-    , "effect"
-    , "foldable-traversable"
-    , "foreign-object"
-    , "generics-rep"
-    , "integers"
-    , "js-timers"
-    , "prelude"
-    , "psci-support"
-    , "random"
-    , "routing"
-    , "sequences"
-    , "spec"
-    , "spec-quickcheck"
-    , "spec-discovery"
-    , "strings"
-    , "thermite"
-    , "uint"
-    , "unicode"
-    , "web-html" ]
-, packages = ./packages.dhall }