Add Social category to Showcase

[rphair]

Tentatively agreed upon after:

• Add Moments to Showcase #1463 (comment)

@katomm suggested an eligible project to add as soon as this tag is established: https://cryptonaut.id 🚀

Pavia I think would have been eligible but their web site has gone 404 and I haven't heard that the project remains viable. I'm not calling for its removal, though it seems appropriate, since I don't know why the PR to remove it was closed:

• Remove Pavia  #1299

I checked all other current projects & none, I believe, are using the Cardano chain for social features (HazelNet aka Vibrant seems reliant on Telegram). So after merge this will show an an empty category until an advocate adds Cryptonaut.

[kylixafonso]

@rphair I think a category for stablecoins, potentially even divided between fiat-backed and algorithmic stablecoins could be a good addition on top of the social category :)
It'd be a category to adopt (algorithmic-stablecoin or stablecoin) for #1480.

[rphair]

@kylixafonso I have some reactions to your last suggestion but please first open up an issue to present that idea to the reviewers: https://github.com/cardano-foundation/developer-portal/issues

[katomm]

@kylixafonso @rphair I agree on the need for a stable coin category. However, I would not currently make a distinction between algorithmic and somewhat secured stable coins, as the category is already small.

[gufmar]

LGTM