Revert "Clean up conf.py"

This reverts commit b2f3ed5.

Author: mcbarton

docs/source/conf.py

@@ -12,12 +12,15 @@
 cd ../../;
 curl -L https://micro.mamba.pm/api/micromamba/linux-64/latest | tar -xvj bin/micromamba;
 export PATH="$PWD/bin:$PATH";
+export MAMBA_EXE="$PWD/bin/micromamba";
 export MAMBA_ROOT_PREFIX="/home/docs/checkouts/readthedocs.org/user_builds/xeus-cpp/conda/";
-eval $(micromamba shell hook --shell bash --root-prefix "$MAMBA_ROOT_PREFIX" 2> /dev/null)";
+__mamba_setup="$("$MAMBA_EXE" shell hook --shell bash --root-prefix "$MAMBA_ROOT_PREFIX" 2> /dev/null)";
+eval "$__mamba_setup";
+alias micromamba="$MAMBA_EXE";
 micromamba create -f environment-wasm-build.yml -y;
 micromamba activate xeus-cpp-wasm-build;
 micromamba create -f environment-wasm-host.yml --platform=emscripten-wasm32;
-mkdir build;
+mkdir -p build;
 cd build;
 export BUILD_PREFIX=$MAMBA_ROOT_PREFIX/xeus-cpp-wasm-build;
 export PREFIX=$MAMBA_ROOT_PREFIX/xeus-cpp-wasm-host;