(add) css theme paths

apps/block_scout_web/assets/css/theme/_variables.scss

@@ -1,5 +1,11 @@
-// @import "neutral_v÷ariables";
+@import "neutral_variables";
+// @import "dai_variables";
+// @import "ethereum_classic_variables";
+// @import "ethereum_variables";
+// @import "goerli_variables";
+// @import "poa_variables";
 @import "posdao_variables";
+// @import "rinkeby_variables";
+// @import "ropsten_variables";
 // @import "sokol_variables";
-// @import "dai_variables";
 @import "theme/base_variables";