disable elixir-tools' elixirls management

dot_config/nvim/lua/plugins/elixir.lua

@@ -7,7 +7,11 @@ return {
     config = function()
       local elixir = require("elixir")
 
-      elixir.setup({})
+      elixir.setup({
+        elixirls = {
+          enable = false, -- handle elixirls through mason
+        },
+      })
     end,
   },
 }