Documentation: Create texture_packs.txt

Combine texture_overrides.txt and sections of lua_api.txt

doc/lua_api.txt

@@ -235,40 +235,6 @@ stripping out the file extension:
 * e.g. `foomod_foothing.png`
 * e.g. `foomod_foothing`
 
-Texture pack directory structure
---------------------------------
-
-    textures
-    |-- Texture Pack
-    |   |-- screenshot.png
-    |   |-- description.txt
-    |   |-- your_texture_1.png
-    |   |-- your_texture_2.png
-    `-- Another Texture Pack
-
-### Texture Pack
-This is a directory containing the entire contents of a single texture pack.
-It can be chosen more or less freely and will also become the name of the
-texture pack. The name must not be “base”.
-
-### `description.txt`
-A file containing a short description of the texture pack to be shown in the
-texture packs tab.
-
-### `screenshot.png`
-A preview image showing an in-game screenshot of this texture pack; it will be
-shown in the texture packs tab. It should have an aspect ratio of 3:2 and a
-minimum size of 300×200 pixels.
-
-### `your_texture_1.png`, `your_texture_2.png`, etc.
-Any other PNG files will be interpreted as textures. They must have the same
-names as the textures they are supposed to override. For example, to override
-the apple texture of Minetest Game, add a PNG file named `default_apple.png`.
-
-The custom textures do not necceessarily require the same size as their
-originals, but this might be required for a few particular textures. When
-unsure, just test your texture pack in-game.
-
 Texture modifiers
 -----------------
 There are various texture modifiers that can be used
@@ -1997,7 +1963,7 @@ Call these functions only at load time!
 * `minetest.register_privilege(name, definition)`
     * `definition`: `"description text"`
     * `definition`: `{ description = "description text", give_to_singleplayer = boolean}`
-      the default of `give_to_singleplayer` is true 
+      the default of `give_to_singleplayer` is true
     * To allow players with basic_privs to grant, see basic_privs minetest.conf setting.
 * `minetest.register_authentication_handler(handler)`
     * See `minetest.builtin_auth_handler` in `builtin.lua` for reference