Improve sidebar navigation by removing headers

- Ensure most pages are reachable through the sidebar, by removing headers on pages that are mostly indexes.
- This also means that some pages now have navigable headers again.

contributing/development/compiling/index.rst

@@ -18,8 +18,7 @@ stripped of extra modules, or an executable targeting engine development.
 The articles below should help you navigate configuration options available, as well as
 prerequisites required to compile Godot exactly the way you need.
 
-Basics of building Godot
-------------------------
+.. rubric:: Basics of building Godot
 
 Let's start with basics, and learn how to get Godot's source code, and then which options
 to use to compile it regardless of your target platform.
@@ -31,8 +30,7 @@ to use to compile it regardless of your target platform.
    getting_source
    introduction_to_the_buildsystem
 
-Building for target platforms
------------------------------
+.. rubric:: Building for target platforms
 
 Below you can find instructions for compiling the engine for your specific target platform.
 Note that Godot supports cross-compilation, which means you can compile it for a target platform
@@ -51,8 +49,7 @@ will try their best to cover all possible situations.
    cross-compiling_for_ios_on_linux
    compiling_for_web
 
-Other compilation targets and options
--------------------------------------
+.. rubric:: Other compilation targets and options
 
 Some additional universal compilation options require further setup. Namely, while Godot
 does have C#/.NET support as a part of its main codebase, it does not get compiled by

contributing/development/core_and_modules/index.rst

@@ -6,8 +6,7 @@ Engine core and modules
 The following pages are meant to introduce the global organization of Godot Engine's
 source code, and give useful tips for extending and fixing the engine on the C++ side.
 
-Getting started with Godot's source code
-----------------------------------------
+.. rubric:: Getting started with Godot's source code
 
 This section covers the basics that you will encounter in (almost) every source file.
 
@@ -25,8 +24,7 @@ This section covers the basics that you will encounter in (almost) every source
    2d_coordinate_systems
    scripting_development
 
-Extending Godot by modifying its source code
---------------------------------------------
+.. rubric:: Extending Godot by modifying its source code
 
 This section covers what you can do by modifying Godot's C++ source code.
 

tutorials/scripting/index.rst

@@ -10,8 +10,7 @@ Here, you will find information that is not already covered in more specific
 sections. For instance, to learn about inputs, we recommend you to read
 :ref:`Inputs <toc-learn-features-inputs>`.
 
-Programming languages
----------------------
+.. rubric:: Programming languages
 
 The sections below each focus on a given programming language.