Update conf.py

Author: mcbarton

docs/source/conf.py

@@ -11,9 +11,9 @@
     command_emscripten = 'cd ..;\
                           mamba init;\
                           . /home/docs/.bashrc;\
-                          mamba create -f environment-wasm-build.yml -y;\
+                          mamba create -p $PWD -f environment-wasm-build.yml -y;\
                           mamba activate xeus-cpp-wasm-build;\
-                          mamba create -f environment-wasm-host.yml --platform=emscripten-wasm32;\
+                          mamba create -p $PWD -f environment-wasm-host.yml --platform=emscripten-wasm32;\
                           mkdir build;\
                           cd build;\
                           export BUILD_PREFIX=$MAMBA_ROOT_PREFIX/envs/xeus-cpp-wasm-build;\