Delete GridMap based terrain

assets/models/terrain.blend.import

@@ -1,51 +0,0 @@
-[remap]
-
-importer="scene"
-importer_version=1
-type="PackedScene"
-uid="uid://buj1g5fpiuqkd"
-path="res://.godot/imported/terrain.blend-0343d6f0e6459ff0512c30a5803c2760.scn"
-
-[deps]
-
-source_file="res://assets/models/terrain.blend"
-dest_files=["res://.godot/imported/terrain.blend-0343d6f0e6459ff0512c30a5803c2760.scn"]
-
-[params]
-
-nodes/root_type=""
-nodes/root_name=""
-nodes/apply_root_scale=true
-nodes/root_scale=1.0
-nodes/import_as_skeleton_bones=false
-meshes/ensure_tangents=true
-meshes/generate_lods=true
-meshes/create_shadow_meshes=true
-meshes/light_baking=1
-meshes/lightmap_texel_size=0.2
-meshes/force_disable_compression=false
-skins/use_named_skins=true
-animation/import=true
-animation/fps=30
-animation/trimming=false
-animation/remove_immutable_tracks=true
-animation/import_rest_as_RESET=false
-import_script/path=""
-_subresources={}
-blender/nodes/visible=0
-blender/nodes/active_collection_only=false
-blender/nodes/punctual_lights=true
-blender/nodes/cameras=true
-blender/nodes/custom_properties=true
-blender/nodes/modifiers=1
-blender/meshes/colors=false
-blender/meshes/uvs=true
-blender/meshes/normals=true
-blender/meshes/tangents=true
-blender/meshes/skins=2
-blender/meshes/export_bones_deforming_mesh_only=false
-blender/materials/unpack_enabled=true
-blender/materials/export_materials=1
-blender/animation/limit_playback=true
-blender/animation/always_sample=true
-blender/animation/group_tracks=true

terrain/terrain_source.tscn

@@ -1,5 +0,0 @@
-[gd_scene load_steps=2 format=3 uid="uid://b16jht8mfqr21"]
-
-[ext_resource type="PackedScene" uid="uid://buj1g5fpiuqkd" path="res://assets/models/terrain.blend" id="1_ourjj"]
-
-[node name="TerrainSource" instance=ExtResource("1_ourjj")]