migrate from flask to quart.

also remove all flaskiness from static file serving.
and reference all vendored scripts on the base tempĺate for simplicity.

lnbits/extensions/lndhub/decorators.py

@@ -1,5 +1,5 @@
 from base64 import b64decode
-from flask import jsonify, g, request
+from quart import jsonify, g, request
 from functools import wraps
 
 from lnbits.core.crud import get_wallet_for_key
@@ -8,7 +8,7 @@ from lnbits.core.crud import get_wallet_for_key
 def check_wallet(requires_admin=False):
     def wrap(view):
         @wraps(view)
-        def wrapped_view(**kwargs):
+        async def wrapped_view(**kwargs):
             token = request.headers["Authorization"].split("Bearer ")[1]
             key_type, key = b64decode(token).decode("utf-8").split(":")
 
@@ -18,7 +18,7 @@ def check_wallet(requires_admin=False):
             g.wallet = get_wallet_for_key(key, key_type)
             if not g.wallet:
                 return jsonify({"error": True, "code": 2, "message": "insufficient permissions"})
-            return view(**kwargs)
+            return await view(**kwargs)
 
         return wrapped_view