Pi devices are more than capable of running web sites and web apps. I'm running a somewhat busy SearXNG instance on a Pi 4, for instance. Just get self-powered

Pi devices are more than capable of running web sites and web apps. I'm running a somewhat busy SearXNG instance on a Pi 4, for instance. Just get self-powered USB attached storage and a Flirc case, and it can be completely fanless (so long as the storage is fanless), and you don't have to worry about your SD card wearing out. Even if you don't get storage with its own power supply, you can use a "Y" USB cable for extra power, provided the same power source is used for the Pi and for the storage. This can have the added benefit of backfeeding power to the Pi, which, again, is fine so long as the power sources are the same. While my Pi 4 is colocated, it has a Flirc case so it can run all four cores at 100% without ever having thermal issues, and the two USB attached disks are mirrored (raidframe), and it has been 100% stable for many, many months of heavy use.