Update the repo | check for expired items | Update descriptions

[prakash-chakraborty]

Some of the swag listings have expired and some don't have a description before it says checkout.

Looking for the following:
a. Remove expired link.
b. Add a brief description of the swag and the process before the check it out link for the ones that don't have one.

[itssiddhantjain]

Hello @Joonsang1994 , please assign this issue to me as I have already worked on this kind of problem in past and has a great experience.

[AYUSHSURYAVANSHI]

hello i am interested to contribute here.