add the --no-deps flag

Author: drbenvincent

CONTRIBUTING.md

@@ -59,10 +59,10 @@ For more instructions see the [Pull request checklist](#pull-request-checklist)
     conda activate CausalPy
     ```
 
-    Install the package (in editable mode) and its development dependencies:
+    Install the package (in editable mode) and its development dependencies. The `--no-deps` flag is used to avoid installing the dependencies of `CausalPy` as they are already installed when installing the development dependencies. This can end up interfering with the conda-only install of pymc.
 
     ```bash
-    pip install -e .
+    pip install -e . --no-deps
     ```
 
 	Install development dependencies

Makefile

@@ -1,7 +1,7 @@
 .PHONY: init lint check_lint test
 
 init:
-	python -m pip install -e .
+	python -m pip install -e . --no-deps
 
 lint:
 	ruff check --fix .