chore: restructure project directory and update Dockerfile paths

app/main.py

@@ -0,0 +1,14 @@
+from fastapi import FastAPI
+
+from api.proxy import router as proxy_router
+
+app = FastAPI(
+    title="thePlugAPI"
+)
+
+app.include_router(proxy_router)
+
+
+@app.get("/")
+async def root():
+    return {"Hello": "World!"}