doc: reorganize files

Separate various autogen files from the documentation .dox files.
Rename .dox files to match the intended tree structure.

doc/dox/tutorial/tutorial1.dox

@@ -0,0 +1,47 @@
+/** \page page_tutorial1 Tutorial - Part 1: Getting Started
+
+
+\ref page_tutorial "Index" | \ref page_tutorial2
+
+In this tutorial we show the basics of a simple PipeWire application.
+Use this tutorial to get started and help you set up your development
+environment.
+
+
+# Initialization
+
+Let get started with the simplest application.
+
+\snippet tutorial1.c code
+
+Before you can use any PipeWire functions, you need to call `pw_init()`.
+
+
+# Compilation
+
+PipeWire provides a pkg-config file named `libpipewire-0.3` (note: the version
+suffix may change with future releases of PipeWire).
+To compile the simple test application, copy it into a test1.c file and
+use pkg-config to provide the required dependencies:
+
+    gcc -Wall test1.c -o test1 $(pkg-config --cflags --libs libpipewire-0.3)
+
+then run it with:
+
+    # ./test1
+    Compiled with libpipewire 0.3.5
+    Linked with libpipewire 0.3.5
+    #
+
+Use your build system's pkg-config support to integrate it into your project.
+For example, a minimal [meson.build](https://mesonbuild.com/) entry would look
+like this:
+
+    project('test1', ['c'])
+    pipewire_dep = dependency('libpipewire-0.3')
+    executable('test1', 'test1.c',
+               dependencies: [pipewire_dep])
+
+\ref page_tutorial "Index" | \ref page_tutorial2
+
+*/