api: Redirect to donate link

src/api/src/main.py

@@ -7,8 +7,13 @@ from io import BytesIO
 from enum import Enum
 from eliot import start_action
 from aiohttp import ClientResponseError
-from fastapi import FastAPI, Request
-from fastapi.responses import FileResponse, HTMLResponse, StreamingResponse
+from fastapi import FastAPI
+from fastapi.responses import (
+    FileResponse,
+    HTMLResponse,
+    RedirectResponse,
+    StreamingResponse,
+)
 from fastapi.staticfiles import StaticFiles
 from create_book import (
     EPUBGenerator,
@@ -198,6 +203,11 @@ async def handle_download(
         )
 
 
+@app.get("/donate")
+def donate():
+    return RedirectResponse("https://buymeacoffee.com/theonlywayup")
+
+
 app.mount("/", StaticFiles(directory=BUILD_PATH), "static")