📝 Add stubs for Security, multi-files, app configurations

docs/tutorial/security/first-steps.md

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+Coming soon...
+
+```Python
+{!./tutorial/src/security/tutorial002.py!}
+```

docs/tutorial/security/intro.md

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+Coming soon...
+
+```Python
+{!./tutorial/src/security/tutorial001.py!}
+```

docs/tutorial/security/oauth2-jwt.md

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+Coming soon...
+
+```Python
+{!./tutorial/src/security/tutorial004.py!}
+```

docs/tutorial/security/simple-oauth2.md

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+Coming soon...
+
+```Python
+{!./tutorial/src/security/tutorial003.py!}
+```