Fix joinstr page

[1440000bytes]

Made changes in 2 points

[1440000bytes]

I think it should just be "joinstr" and "nostr" should be removed. Not sure what should be changed in the JSON:

{
  "title": "Coinjoins.org - Joinstr Review",
  "wallet_name": "Joinstr",
  "protocol_name": "Nostr",
  "wallet_logo": "joinstr",

There is no joinstr wallet. Joinstr is a protocol so maybe wallet_name can be removed?

[Gustavojfe]

@thibistaken could we tweak the code so the joinstr page doesn't need both a wallet name and a protocol name, so it can only be Joinstr (without Nostr)?