Fix outdated purpur link

The link given was to a website not only without a valid SSL cert, it was likely outdated given that Purpur's official site is https://purpurmc.org.

Author: osfanbuff63

common-pitfalls-and-best-practices.md

@@ -9,7 +9,7 @@ There are two types of people - those who make backups, and those who will start
 By running outdated software versions you risk players abusing unpatched exploits, including item duplication (infinite items). It also adds an inconvenience factor since your players have to specifically downgrade their client version to match your server. This can be circumvented by using a protocol hack, but it's not ideal.
 
 ## Don't run Bukkit/Spigot anymore
-Bukkit and Spigot are basically in maintenance mode. They update anytime there's a new version and if a critical exploit is found, but don't add any performance updates. This means any performance issues you may experience on those softwares will never be improved over time. To avoid that, upgrade to [Paper](https://papermc.io/downloads) or [Purpur](https://purpur.pl3x.net/downloads). Bukkit/Spigot plugins will work just as well (maybe even better) with the server software listed. If they don't, then it's safe to assume that the plugin dev is either doing things that they shouldn't or did a negligent job creating their plugin. They also add optimization patches like a chunk loading system that can take advantage of multiple cpu threads or a setting that allows the server to tick less chunks than it actually sends to the player. See the [main optimization guide](https://github.com/YouHaveTrouble/minecraft-optimization) for more details.
+Bukkit and Spigot are basically in maintenance mode. They update anytime there's a new version and if a critical exploit is found, but don't add any performance updates. This means any performance issues you may experience on those softwares will never be improved over time. To avoid that, upgrade to [Paper](https://papermc.io/downloads) or [Purpur](https://purpurmc.org/downloads). Bukkit/Spigot plugins will work just as well (maybe even better) with the server software listed. If they don't, then it's safe to assume that the plugin dev is either doing things that they shouldn't or did a negligent job creating their plugin. They also add optimization patches like a chunk loading system that can take advantage of multiple cpu threads or a setting that allows the server to tick less chunks than it actually sends to the player. See the [main optimization guide](https://github.com/YouHaveTrouble/minecraft-optimization) for more details.
 
 ## Avoid shared hosting if possible
 Shared hosts are usually the cheapest option, and that's for a valid reason. They offer you 2 types of resources - guaranteed and shared. Guaranteed resources are usually laughably low and may not be enough to run a server for a few players. Shared resources on the other hand are usually enough to run a server with decent performance. There is a catch, though; shared resources, like the name implies, are shared between your server and other servers on the same physical machine. Your server can only benefit from having them when no other server uses them. The situation where your server fully utilises shared resources is pretty much impossible to happen, as most shared hosts oversell their resources. Like airplane tickets, the hosting site sells more resources than they have available in hopes that not all of them will be used. This often leads to situations where all servers are bogged down because there aren't enough resources to spare.