docs: Remove outdated internals docs

docs/development/index.rst

@@ -7,4 +7,3 @@ Development
 
     roadmap
     contributing
-    internals

docs/development/internals.rst

@@ -1,113 +0,0 @@
-*********
-Internals
-*********
-
-Some of the following notes and details will hopefully be useful when you start
-developing on Mopidy, while some may only be useful when you get deeper into
-specific parts of Mopidy.
-
-In addition to what you'll find here, don't forget the :doc:`/api/index`.
-
-
-Class instantiation and usage
-=============================
-
-The following diagram shows how Mopidy is wired together with the MPD client,
-the Spotify service, and the speakers.
-
-**Legend**
-
-- Filled red boxes are the key external systems.
-- Gray boxes are external dependencies.
-- Blue circles lives in the ``main`` process, also known as ``CoreProcess``.
-  It is processing messages put on the core queue.
-- Purple circles lives in a process named ``MpdProcess``, running an
-  :mod:`asyncore` loop.
-- Green circles lives in a process named ``GStreamerProcess``.
-- Brown circle is a thread living in the ``CoreProcess``.
-
-.. digraph:: class_instantiation_and_usage
-
-    "main" [ color="blue" ]
-    "CoreProcess" [ color="blue" ]
-
-    # Frontend
-    "MPD client" [ color="red", style="filled", shape="box" ]
-    "MpdFrontend" [ color="blue" ]
-    "MpdProcess" [ color="purple" ]
-    "MpdServer" [ color="purple" ]
-    "MpdSession" [ color="purple" ]
-    "MpdDispatcher" [ color="blue" ]
-
-    # Backend
-    "Libspotify\nBackend" [ color="blue" ]
-    "Libspotify\nSessionManager" [ color="brown" ]
-    "pyspotify" [ color="gray", shape="box" ]
-    "libspotify" [ color="gray", shape="box" ]
-    "Spotify" [ color="red", style="filled", shape="box" ]
-
-    # Output/mixer
-    "GStreamer\nOutput" [ color="blue" ]
-    "GStreamer\nSoftwareMixer" [ color="blue" ]
-    "GStreamer\nProcess" [ color="green" ]
-    "GStreamer" [ color="gray", shape="box" ]
-    "Speakers" [ color="red", style="filled", shape="box" ]
-
-    "main" -> "CoreProcess" [ label="create" ]
-
-    # Frontend
-    "CoreProcess" -> "MpdFrontend" [ label="create" ]
-    "MpdFrontend" -> "MpdProcess" [ label="create" ]
-    "MpdFrontend" -> "MpdDispatcher" [ label="create" ]
-    "MpdProcess" -> "MpdServer" [ label="create" ]
-    "MpdServer" -> "MpdSession" [ label="create one\nper client" ]
-    "MpdSession" -> "MpdDispatcher" [
-        label="pass requests\nvia core_queue" ]
-    "MpdDispatcher" -> "MpdSession" [
-        label="pass response\nvia reply_to pipe" ]
-    "MpdDispatcher" -> "Libspotify\nBackend" [ label="use backend API" ]
-    "MPD client" -> "MpdServer" [ label="connect" ]
-    "MPD client" -> "MpdSession" [ label="request" ]
-    "MpdSession" -> "MPD client" [ label="response" ]
-
-    # Backend
-    "CoreProcess" -> "Libspotify\nBackend" [ label="create" ]
-    "Libspotify\nBackend" -> "Libspotify\nSessionManager" [
-        label="creates and uses" ]
-    "Libspotify\nSessionManager" -> "Libspotify\nBackend" [
-        label="pass commands\nvia core_queue" ]
-    "Libspotify\nSessionManager" -> "pyspotify" [ label="use Python\nwrapper" ]
-    "pyspotify" -> "Libspotify\nSessionManager" [ label="use callbacks" ]
-    "pyspotify" -> "libspotify" [ label="use C library" ]
-    "libspotify" -> "Spotify" [ label="use service" ]
-    "Libspotify\nSessionManager" -> "GStreamer\nProcess" [
-        label="pass commands\nand audio data\nvia output_queue" ]
-
-    # Output/mixer
-    "Libspotify\nBackend" -> "GStreamer\nSoftwareMixer" [
-        label="create and\nuse mixer API" ]
-    "GStreamer\nSoftwareMixer" -> "GStreamer\nProcess" [
-        label="pass commands\nvia output_queue" ]
-    "CoreProcess" -> "GStreamer\nOutput" [ label="create" ]
-    "GStreamer\nOutput" -> "GStreamer\nProcess" [ label="create" ]
-    "GStreamer\nProcess" -> "GStreamer" [ label="use library" ]
-    "GStreamer" -> "Speakers" [ label="play audio" ]
-
-
-Thread/process communication
-============================
-
-.. warning::
-    This section is currently outdated.
-
-- Everything starts with ``Main``.
-- ``Main`` creates a ``Core`` process which runs the frontend, backend, and
-  mixer.
-- Mixers *may* create an additional process for communication with external
-  devices, like ``NadTalker`` in this example.
-- Backend libraries *may* have threads of their own, like ``despotify`` here
-  which has additional threads in the ``Core`` process.
-- ``Server`` part currently runs in the same process and thread as ``Main``.
-- ``Client`` is some external client talking to ``Server`` over a socket.
-
-.. image:: /_static/thread_communication.png