Add discourse.group for Civilized Discourse Construction Kit, Inc. (#768)
Add discourse.group for Civilized Discourse Construction Kit, Inc. (#768)

At Discourse (Civilized Discourse Construction Kit, Inc.), we host free
discussion forums for open source organizations under the `discourse.group` domain.
https://blog.discourse.org/2018/11/free-hosting-for-open-source-v2/

Therefore, each subdomain of discourse.group should be treated as a distinct domain.
Website: https://www.discourse.org/

As we host multiple forums under the discourse.group domain we'd like to add it to the PSL to:

1. Ensure that each subdomain of discourse.group is treated as a distinct domain.
2. Adding cookie security.

publicsuffix/list,sleevi/list,sleevi/list,sleevi/list,publicsuffix/list,publicsuffix/list,sleevi/list,publicsuffix/list