Add Threads support

[jpanther]

Discussed in #835

^{Originally posted by lippoliv March 19, 2024}
Thanks @jpanther for your effort with Congo :) I'm new to Hugo, I saw your theme, I liked it, I started a new project using it. Works like a charm right now.

As time goes by, I introduce "new" stuff to my project. Recently I "connected" several social media platforms. I didn't found out how to linke Instagrams new Service "threads" in the config? I think currently it's not supported.

Would you add it? I hope it's not too much effort...

I know it's not too big right now (at least in Germany) but it will grow.