📝 Add source examples for docs

docs_src/frontend/tutorial001_py310.py

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+from fastapi import FastAPI
+
+app = FastAPI()
+
+app.frontend("/", directory="dist")

docs_src/frontend/tutorial002_py310.py

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+from fastapi import FastAPI
+
+app = FastAPI()
+
+app.frontend("/", directory="dist", fallback="index.html")

docs_src/frontend/tutorial003_py310.py

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+from fastapi import FastAPI
+
+app = FastAPI()
+
+app.frontend("/", directory="dist", fallback="404.html")

docs_src/frontend/tutorial004_py310.py

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+from fastapi import APIRouter, FastAPI
+
+app = FastAPI()
+router = APIRouter()
+
+router.frontend("/", directory="dist", fallback="index.html")
+app.include_router(router, prefix="/app")

docs_src/frontend/tutorial005_py310.py

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+from fastapi import FastAPI
+
+app = FastAPI()
+
+app.frontend("/", directory="dist", fallback=None)