Update Firefish account

The maintainer was changed to @dev@post.naskya.net who set up a new
account for communicating updates because fedi.software is gone.

Signed-off-by: André Jaenisch <andre.jaenisch@posteo.de>

README.md

@@ -61,7 +61,7 @@ Emoji's for each entry provide additional information on project status:
 
 * [**Epicyon**](https://gitlab.com/bashrc2/epicyon) ([site](https://libreserver.org/epicyon)): ActivityPub server implementing S2S and C2S protocols, suitable for single board computers. Includes features such as moderation tools, post expiry, content warnings, and image descriptions `AGPL-3.0, Python`
 
-* [**Firefish**](https://git.joinfirefish.org/firefish/firefish) ([site](https://joinfirefish.org/), [Fedi account](https://fedi.software/@firefish)): An actively developed, community-driven fork of Misskey with many quality of life improvements for users and admins alike `AGPL-3.0, TypeScript`
+* [**Firefish**](https://git.joinfirefish.org/firefish/firefish) ([site](https://joinfirefish.org/), [Fedi account](https://info.firefish.dev/@firefish)): An actively developed, community-driven fork of Misskey with many quality of life improvements for users and admins alike `AGPL-3.0, TypeScript`
 
 * [**FlockingBird**](https://github.com/flockingbird/roost) ([site](https://search.flockingbird.social), [Fedi account](https://fosstodon.org/@flockingbird)): social network for professionals (WIP) `Unknown, Unknown`