Update guides to pipenv python starter (#644)

Update existing guides to use pipenv starter.

Will update to new uv starter in future

Author: tjholm

docs/guides/python/create-histogram.mdx

@@ -24,7 +24,7 @@ We'll be making a serverless application which can take information from a HTTP
 We'll start by creating a new project for our API.
 
 ```bash
-nitric new histogram-api py-starter
+nitric new histogram-api py-starter-pipenv
 ```
 
 Next, open the project in your editor of choice.

docs/guides/python/graphql.mdx

@@ -38,7 +38,7 @@ Here's a video of this guide built with Node.js:
 We'll start by creating a new project for our API.
 
 ```bash
-nitric new my-profile-api py-starter
+nitric new my-profile-api py-starter-pipenv
 ```
 
 Next, open the project in your editor of choice.

docs/guides/python/scheduled-report.mdx

@@ -28,7 +28,7 @@ We'll create a scheduled service which will run on a daily basis to create and s
 First, we'll create a new nitric project and install the necessary Python packages.
 
 ```bash
-nitric new reports py-starter
+nitric new reports py-starter-pipenv
 pipenv install google-auth google-api-python-client
 pipenv install --dev
 ```

docs/guides/python/serverless-rest-api-example.mdx

@@ -43,7 +43,7 @@ languages:
 We'll start by creating a new project for our API.
 
 ```bash
-nitric new my-profile-api py-starter
+nitric new my-profile-api py-starter-pipenv
 ```
 
 Next, open the project in your editor of choice.

docs/guides/python/text-prediction.mdx

@@ -23,7 +23,7 @@ We'll be making a simple text based prediction model based off of the book Pride
 We'll start by creating a new project for our API.
 
 ```bash
-nitric new prediction-api py-starter
+nitric new prediction-api py-starter-pipenv
 ```
 
 Next, open the project in your editor of choice.