Use scalameta's Discord rather than gitter for support

[bjaglin]

I recently learnt about the #scalafix channel on the Scalameta servers (advertized in https://www.scala-lang.org/blog/2021/12/21/discord.html#what-other-chat-servers-exist). I am not fully convinced Discord is the way to go (sharing the same opacity concerns as https://alexn.org/blog/2022/04/09/scala-gitter-discord-mistake/), but I think it's better to stay close to the Scalameta community. We should delete the gitter room once this is merged.

[tgodzik]

Thanks for updating this! And sorry we didn't explicitely update the information on scalafix website 😨

There hasn't been that much traffic on scalafix channel and we've been able to respond to most of it.

Btw. overall I am much more happier with discord, there is much more moderation options and feels a bit more of safe environment.

[ckipp01]

I am not fully convinced Discord is the way to go (sharing the same opacity concerns as https://alexn.org/blog/2022/04/09/scala-gitter-discord-mistake/), but I think it's better to stay close to the Scalameta community. We should delete the gitter room once this is merged.

Just a heads up, especially for those that don't love Discord, I have bridged all these rooms. So if Matrix is more your jam, you can find the Matrix room for the Discord bridge of scalacenter/scalafix at https://matrix.to/#/#scalacenter:scalafix. You may want to mention that as well.

[mvasyliv]

we have in source code line
val res = df1.unionAll(df2)
How to get types for df1 and df2 in scalafix?