Just remove the dep (#1007)

Author: penelopeysm

docs/Project.toml

@@ -1,7 +1,6 @@
 [deps]
 AbstractPPL = "7a57a42e-76ec-4ea3-a279-07e840d6d9cf"
 Accessors = "7d9f7c33-5ae7-4f3b-8dc6-eff91059b697"
-DataStructures = "864edb3b-99cc-5e75-8d2d-829cb0a9cfe8"
 Distributions = "31c24e10-a181-5473-b8eb-7969acd0382f"
 Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
 DocumenterMermaid = "a078cd44-4d9c-4618-b545-3ab9d77f9177"
@@ -16,7 +15,6 @@ StableRNGs = "860ef19b-820b-49d6-a774-d7a799459cd3"
 [compat]
 AbstractPPL = "0.11, 0.12"
 Accessors = "0.1"
-DataStructures = "0.18"
 Distributions = "0.25"
 Documenter = "1"
 DocumenterMermaid = "0.1, 0.2"