Update Conduit maturity to beta

https://gitlab.com/famedly/conduit#what-is-the-current-status

Author: Andrei E

gatsby/content/projects/servers/conduit.mdx

@@ -7,7 +7,7 @@ thumbnail: /docs/projects/images/conduit.svg
 screenshot: /docs/projects/images/conduit.svg
 description: Conduit is a simple, fast and reliable chat server written in Rust
 author: Timo Kösters
-maturity: Alpha
+maturity: Beta
 language: Rust
 license: Apache-2.0
 repo: https://gitlab.com/famedly/conduit