Move some files

API.md

@@ -141,7 +141,7 @@ Recipes can be registered from a given URL containing a JSON file (HTTP support
 
 ```Lua
 i3.register_craft({
-	url = "https://raw.githubusercontent.com/minetest-mods/i3/main/etc/test_online_recipe.json"
+	url = "https://raw.githubusercontent.com/minetest-mods/i3/main/tests/test_online_recipe.json"
 })
 ```
 

init.lua

@@ -3317,5 +3317,5 @@ for size, rcp in pairs(bag_recipes) do
 	core.register_craft {type = "fuel", recipe = bagname, burntime = 3}
 end
 
---dofile(modpath .. "/etc/test_tabs.lua")
---dofile(modpath .. "/etc/test_custom_recipes.lua")
+--dofile(modpath .. "/tests/test_tabs.lua")
+--dofile(modpath .. "/tests/test_custom_recipes.lua")