Pyproject doc link fix (#18)

* Added doc link to pyproject

Poetry won't install properly if no link exists in the toml file. I've linked it to what is also placed on the repo.

* Inserted updated doc link

pyproject.toml

@@ -6,7 +6,7 @@ authors = ["Nikhil Iyer <[email protected]>", "Hammad Nasir <hammadn99@gma
 readme = "README.md"
 packages = [{include = "manim_data_structures", from = "src"}]
 repository = "https://github.com/ufosc/manim-data-structures"
-documentation = ""
+documentation = "https://docs.manim.community/en/stable/"
 
 [tool.poetry.dependencies]
 python = ">=3.8.0,<3.11"