refactor: 将默认路径从/leonos更改为/rc

修改多个文件中的默认路径变量，将/leonos统一替换为/rc，以简化路径命名并保持一致性

data/computercraft/lua/rom/programs/shell.lua

@@ -74,7 +74,7 @@ for k, v in pairs(aliases) do
   shell.setAlias(k, v)
 end
 
-local completions = "/leonos/completions"
+local completions = "/rc/completions"
 for _, prog in ipairs(fs.list(completions)) do
   dofile(fs.combine(completions, prog))
 end