Channel Name Not Displayed When Server Name is Displayed

[sirplatypos]

When I view the chat history for an entire server as opposed to only a single channel, the channel name of each message is prefixed by the name of the server. This blocks the name of the channel from being visible because of the size.

[StarlitGhost]

I've made it possible to specify shorter aliases for server names in the config file, which solves this for me.

It currently lives here: https://github.com/StarlitGhost/Discurses/tree/short-server-names

I'll submit a PR for it soonish, but I don't know if I'm going about it in the best way so I'm hoping for feedback on that.

I had another idea for specifying them at runtime via a dialogue window, like the tab rename window, but I couldn't get that to work reliably (and it wasn't persistent).