add shell highlighting for environment commands

Author: munkm

content/how-tos/how-to-create-environments.md

@@ -25,33 +25,33 @@ needed dependencies for a project.
 
 With venv to create  environment associated with a project folder called `science`. 
 
-```
+```shell
 python -m venv science
 ```
 
 Start using it by activating it as follows:
 
-```
+```shell
 source science/bin/activate
 ```
 
 You are now ready to install Scientific Python packages using `pip`! For example:
 
-```
+```shell
 pip install ipython numpy scipy
 ```
 
 Often you'll interact with projects that have a specific list of dependencies (for development 
 environments, testing environments, or the project itself). You can install the list of dependencies
 with pip in your venv using: 
 
-```
+```shell
 pip install -r <path/to/requirements.txt>
 ```
 
 Remember to re-activate your environment every time you open a new terminal, using:
 
-```
+```shell
 source science/bin/activate
 ```
 
@@ -62,34 +62,34 @@ You can find more information on using venv for packaging
 
 With conda, we can create a new environment named science (-n is the same as passing --name):
 
-```
+```shell
 conda create -n science
 ```
 
 Start using your environment by activating it: 
 
-```
+```shell
 conda activate science
 ```
 
 You are now ready to install Scientific Python packages using `conda`!
 For example:
 
-```
+```shell
 conda install ipython numpy scipy
 ```
 
 Some projects distribute environment files with listed dependencies with an `environment.yml` file. 
 The first line of this file sets the environment's name. To
 create an environment and install the dependencies with this file, use: 
 
-```
+```shell
 conda env create -f <path/to/environment.yml>
 ```
 
 Remember to re-activate your environment every time you open a new terminal:
 
-```
+```shell
 conda activate science
 ```
 
@@ -100,32 +100,32 @@ You can find more information on using conda for environments
 
 With mamba, like conda, we can create a new environment named science (-n is the same as passing --name):
 
-```
+```shell
 mamba create -n science
 ```
 
 Start using your environment by activating it: 
 
-```
+```shell
 mamba activate science
 ```
 
 You are now ready to install Scientific Python packages using `mamba`!
 For example:
 
-```
+```shell
 mamba install ipython numpy scipy
 ```
 
 To install a specific environment from a `.yml` file, use: 
 
-```
+```shell
 mamba create -f </path/to/environment.yml>
 ```
 
 Remember to re-activate your environment every time you open a new terminal:
 
-```
+```shell
 mamba activate science
 ```
 
@@ -134,34 +134,35 @@ You can find more information on using mamba in the
 
 ### Set up a virtual environment using uv 
 
-To create a new environment using uv in our project folder called `science`:  
+To create a new environment using uv in a project folder called `science`, 
+navigate to that folder and execute:  
 
-```
+```shell
 uv venv
 ```
 
 Start using your environment by activating it: 
 
-```
+```shell
 source .venv/bin/activate
 ```
 
 You are now ready to install Scientific Python packages using `uv`!
 For example:
 
-```
+```shell
 uv pip install ipython numpy scipy
 ```
 
 To install dependencies from a requirements file, use: 
 
-```
+```shell
 uv pip install -f </path/to/requirements.txt>
 ```
 
 Remember to re-activate your environment time you open a new terminal:
 
-```
+```shell
 source <path/to/science/>.venv/bin/activate
 ```
 
@@ -172,34 +173,37 @@ You can find more information on using uv for environments
 
 To initialize a new project with pixi in our project called `science`, execute:   
 
-```
+```shell
 pixi init 
 ```
 
 You are now ready to install Scientific Python packages as dependencies in this project!
 From the science directory, execute:
 
-```
+```shell
 pixi add ipython numpy scipy
 ```
 
 To install dependencies from a file like `environment.yml`, use: 
 
-```
+```shell
 pixi init --import <path/to/environment.yml>
 ```
 
 Remember to re-activate your environment when you re-open a terminal. Navigate to 
 the science folder, and execute:
 
-```
+```shell
 pixi shell 
 ```
 
+This will drop you into the default environment for the pixi project, with all 
+dependencies in that environment accessible to you in that shell. 
+
 A pixi project may have multiple environments defined in the `pixi.toml` file. To 
 load a specific environment: 
 
-```
+```shell
 pixi shell --environment=<envname> 
 ```