Use jupyter-myst-build-proxy from conda-forge (#38)

Author: mfisher87

docker/environment.yml

@@ -41,6 +41,7 @@ dependencies:
   # Publishing
   - "mystmd"
   - "typst"
+  - "jupyter-myst-build-proxy >=0.5.0"
 
   # Testing and validation
   - "ruff"
@@ -52,8 +53,3 @@ dependencies:
 
   # Infrastructure
   - "jupyter-server-proxy"  # Enable proxying MyST sites built from CLI, accessed at `$PREFIX/proxy/$PORT`
-
-  # Pip-only dependencies... ideally we get these on conda-forge.
-  - "pip"
-  - pip:
-    - "jupyter-myst-build-proxy >=0.5.0"