feat: Add Dockerfile template (#27)

.changeset/healthy-insects-check.md

helpers/python.ts

helpers/typescript.ts

templates/components/deployments/python/Dockerfile

templates/components/deployments/typescript/Dockerfile

templates/components/loaders/python/__init__.py

templates/components/loaders/python/web.py

templates/types/simple/fastapi/README-template.md

templates/types/streaming/express/README-template.md

templates/types/streaming/fastapi/README-template.md

templates/types/streaming/nextjs/README-template.md