Update the "How to join the server" tutorial video

This video is "specific" to Factions in that it shows the "og-factions.net" IP, and even shows this IP being typed in the video. This video is linked from the "-ip" command in Discord, and the bedrock links channel in discord. Given that Factions isn't what's currently being promoted, it doesn't really make sense for this to be the video that's linked. I like the idea of a "general" how to join video that isn't gamemode specific. This would also be more future proof when Skyblock releases. Making an RPG specific one is also an option though.