doc: Remove weekly bug triage call details as its nolonger active

Its been few months we didnt host this call, so there is no point
in keeping it in the doc.

Signed-off-by: Humble Chirammal <hchiramm@redhat.com>

README.md

@@ -115,10 +115,6 @@ if you are interested to contribute to this repo.
 
 Please submit an issue at: [Issues](https://github.com/ceph/ceph-csi/issues)
 
-## Weekly Bug Triage call
-
-We conduct weekly bug triage calls at our slack channel on Tuesdays.
-More details are available [here](https://github.com/ceph/ceph-csi/issues/463)
 
 ## Dev standup