Add toctrees for new repo organization

Also renamed Getting started back to Step by step as requested by reduz.

(cherry picked from commit fcbab02811)

learning/editor/index.rst

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+Editor manual
+=============
+
+.. toctree::
+   :maxdepth: 1
+   :name: toc-learn-editor
+
+   2d_and_3d_keybindings
+   unity_to_godot
+   command_line_tutorial
+
+.. ue4_to_godot
+.. debugging

learning/features/2d/index.rst

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+2D
+==
+
+.. toctree::
+   :maxdepth: 1
+   :name: toc-learn-features-2d
+
+   2d_transforms
+   canvas_layers
+   using_tilemaps
+   custom_drawing_in_2d
+   particle_systems_2d

learning/features/3d/index.rst

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+3D
+==
+
+.. toctree::
+   :maxdepth: 1
+   :name: toc-learn-features-3d
+
+   introduction_to_3d
+   3d_performance_and_limitations
+   importing_3d_meshes
+   importing_3d_scenes
+   materials
+   fixed_materials
+   high_dynamic_range
+   using_gridmaps

learning/features/animation/index.rst

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+Animation
+=========
+
+.. toctree::
+   :maxdepth: 1
+   :name: toc-learn-features-animation
+
+   cutout_animation

learning/features/gui/index.rst

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+GUI
+===
+
+.. toctree::
+   :maxdepth: 1
+   :name: toc-learn-features-gui
+
+   gui_skinning
+   custom_gui_controls
+   size_and_anchors
+   bbcode_in_richtextlabel
+
+.. gui_containers

learning/features/index.rst

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+Engine features
+===============
+
+.. toctree::
+   :maxdepth: 1
+   :name: toc-learn-features
+
+   math/index
+   2d/index
+   3d/index
+   gui/index
+   physics/index
+   viewports/index
+   inputs/index
+   animation/index
+   lighting/index
+   shading/index
+   networking/index
+   platform/index
+   misc/index
+
+.. audio/index

learning/features/inputs/index.rst

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+Inputs
+======
+
+.. toctree::
+   :maxdepth: 1
+   :name: toc-learn-features-inputs
+
+   inputevent
+   mouse_and_input_coordinates

learning/features/lighting/index.rst

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+Lighting
+========
+
+.. toctree::
+   :maxdepth: 1
+   :name: toc-learn-features-lighting
+
+   lighting
+   shadow_mapping

learning/features/math/index.rst

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+Math
+====
+
+.. toctree::
+   :maxdepth: 1
+   :name: toc-learn-features-math
+
+   vector_math
+   matrices_and_transforms

learning/features/misc/index.rst

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+Miscellaneous
+=============
+
+.. toctree::
+   :maxdepth: 1
+   :name: toc-learn-features-misc
+
+   background_loading
+   data_paths
+   saving_games
+   encrypting_save_games
+   handling_quit_requests
+   pausing_games
+   internationalizing_games
+   locales
+   binary_serialization_api

learning/features/networking/index.rst

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+Networking
+==========
+
+.. toctree::
+   :maxdepth: 1
+   :name: toc-learn-features-networking
+
+   high_level_multiplayer
+   http_client_class
+   ssl_certificates
+
+.. managing_tcp_udp_connections.rst

learning/features/physics/index.rst

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+Physics
+=======
+
+.. toctree::
+   :maxdepth: 1
+   :name: toc-learn-features-physics
+
+   physics_introduction
+   ray-casting
+   kinematic_character_2d

learning/features/platform/index.rst

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+Platform-specific
+=================
+
+.. toctree::
+   :maxdepth: 1
+   :name: toc-learn-features-platform
+
+   android_in_app_purchases
+   services_for_ios

learning/features/shading/index.rst

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+Shading
+=======
+
+.. toctree::
+   :maxdepth: 1
+   :name: toc-learn-features-shading
+
+   shading_language
+   shader_materials
+   screen-reading_shaders

learning/features/viewports/index.rst

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+Viewports
+=========
+
+.. toctree::
+   :maxdepth: 1
+   :name: toc-learn-features-viewports
+
+   viewports
+   multiple_resolutions

learning/scripting/gdscript/index.rst

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+GDScript
+========
+
+.. toctree::
+   :maxdepth: 1
+   :name: toc-learn-scripting-gdscript
+
+   gdscript_basics
+   gdscript_advanced
+   gdscript_format_string

learning/scripting/index.rst

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+Scripting
+=========
+
+.. toctree::
+   :maxdepth: 1
+   :name: toc-learn-scripting
+
+   gdscript/index

learning/step_by_step/index.rst

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+Step by step
+============
+
+.. toctree::
+   :maxdepth: 1
+   :name: toc-learn-step_by_step
+
+   scenes_and_nodes
+   instancing
+   instancing_continued
+   scripting
+   scripting_continued
+   simple_2d_game
+   gui_tutorial
+   splash_screen
+   animations
+   resources
+   filesystem
+   scene_tree
+   singletons_autoload

learning/workflow/assets/index.rst

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+Assets workflow
+===============
+
+.. toctree::
+   :maxdepth: 1
+   :name: toc-learn-workflow-assets
+
+   import_process
+   managing_image_files
+   importing_textures
+   importing_audio_samples
+   importing_fonts
+   importing_translations
+   exporting_images

learning/workflow/export/index.rst

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+Export
+======
+
+.. toctree::
+   :maxdepth: 1
+   :name: toc-learn-workflow-export
+
+   exporting_projects
+   exporting_for_pc
+   exporting_for_ios
+   exporting_for_uwp
+   exporting_for_android
+   exporting_for_web
+   one-click_deploy

learning/workflow/index.rst

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+Project workflow
+================
+
+.. toctree::
+   :maxdepth: 1
+   :name: toc-learn-workflow
+
+   project_setup/index
+   assets/index
+   export/index

learning/workflow/project_setup/index.rst

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+Project setup
+=============
+
+.. toctree::
+   :maxdepth: 1
+   :name: toc-learn-workflow-project_setup
+
+   project_organization
+
+.. plugins_from_assetlib
+.. cvs