index: links to blog and social

Best not to hide them.

Signed-off-by: Matthieu Baerts (NGI0) <[email protected]>

index.md

@@ -128,6 +128,8 @@ for more details.
 * Mailing List: [[email protected]](mailto:[email protected]) (and [archives](https://lore.kernel.org/mptcp))
 * IRC: [#mptcp](https://web.libera.chat/?nick=mptcp-dev-guest?#mptcp) on libera.chat
 * Online [Meetings](https://github.com/multipath-tcp/mptcp_net-next/wiki/Meetings)
+* [Blog](https://blog.mptcp.dev)
+* [Fediverse <i class="fa-brands fa-mastodon"></i>](https://social.kernel.org/mptcp)
 
 ## Projects