💥 Remove /widget static endpoint

This endpoint shall be served by a dedicated static HTTP server.

backend/main.py

@@ -4,7 +4,6 @@ import uvicorn
 from contextlib import asynccontextmanager
 from fastapi import FastAPI, Request
 from fastapi.middleware.cors import CORSMiddleware
-from fastapi.staticfiles import StaticFiles
 from fastapi_cache import FastAPICache
 from opentelemetry import trace
 from opentelemetry.exporter.otlp.proto.http.trace_exporter import OTLPSpanExporter
@@ -41,7 +40,6 @@ app.add_middleware(
     allow_headers=["*"],
 )
 
-app.mount("/widget", StaticFiles(directory="../frontend/", html=True), name="widget")
 
 # The cache-control header entry is not managed properly by fastapi-cache:
 # For now, a request with a cache-control set to no-cache
@@ -60,7 +58,6 @@ async def fastapi_cache_issue_144_workaround(request: Request, call_next):
     return await call_next(request)
 
 
-
 app.include_router(line.router)
 app.include_router(stop.router)