guides: add django (#24851)

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## Description

Added simple Django guide. 

https://deploy-preview-24851--docsdocker.netlify.app/guides/django/

## Related issues or tickets

Closes #21277

## Reviews

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- [ ] Editorial review

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Signed-off-by: Craig Osterhout <craig.osterhout@docker.com>

Author: craig-osterhout

_vale/config/vocabularies/Docker/accept.txt

@@ -106,6 +106,7 @@ Gravatar
 gRPC
 Groq
 Grype
+Gunicorn
 HyperKit
 inferencing
 initializer