Comment-out disabled providers

paper2remarkable/providers/__init__.py

@@ -3,7 +3,6 @@
 from .acl import ACL
 from .acm import ACM
 from .arxiv import Arxiv
-from .citeseerx import CiteSeerX  # disabled, incomplete html doc received
 from .cvf import CVF
 from .diva import DiVA
 from .eccc import ECCC
@@ -18,15 +17,16 @@
 from .pdf_url import PdfUrl
 from .pmlr import PMLR
 from .pubmed import PubMed
-
-# The following providers are no longer functional due to Cloudflare blocking
-# automated access, and have therefore been removed from the list of providers
-# below.
-from .sagepub import SagePub
-from .science_direct import ScienceDirect
 from .semantic_scholar import SemanticScholar
 from .springer import Springer
-from .tandfonline import TandFOnline
+
+# # The following providers are no longer functional due to Cloudflare blocking
+# # automated access, and have therefore been removed from the list of providers
+# # below.
+# from .citeseerx import CiteSeerX  # disabled, incomplete html doc received
+# from .sagepub import SagePub
+# from .science_direct import ScienceDirect
+# from .tandfonline import TandFOnline
 
 # NOTE: Order matters here, PdfUrl and HTML should be last
 providers = [