[gnome-builder] doc: remove local build section

[Christian Hergert <chergert src gnome org>]

commit 93a7d6f28bcbc94c847e31fdcea6a3c3dd09289a
Author: Christian Hergert <chergert redhat com>
Date:   Wed Sep 4 12:55:57 2019 -0700

    doc: remove local build section
    
    This is broken and not how we want people doing development anyway. Just
    click Run from within Builder.

 doc/help/installation.rst | 22 ----------------------
 1 file changed, 22 deletions(-)
---
diff --git a/doc/help/installation.rst b/doc/help/installation.rst
index 02deac925..c59b2fa90 100644
--- a/doc/help/installation.rst
+++ b/doc/help/installation.rst
@@ -49,28 +49,6 @@ You can also use the command line to install Builder:
 
 .. note:: Nightly builds are built with tracing enabled. The tracing is fairly lightweight, but it includes 
a great deal of more debugging information.
 
-Local Flatpak Builds
---------------------
-
-You can also build Builder as a flatpak yourself to test local changes. First, make a repo for your local 
builds:
-
-.. code-block:: sh
-
-   $ mkdir ~/my-flatpak-builds
-   $ flatpak remote-add --user --no-gpg-verify my-flatpak-builds ~/my-flatpak-builds
-
-Now, in Builder's source directory, use ``flatpak-builder`` to build a Builder flatpak and install it
-
-.. code-block:: sh
-
-   $ git clone https://gitlab.gnome.org/GNOME/gnome-builder.git
-   $ cd gnome-builder
-   $ mkdir app
-   $ flatpak-builder --ccache --repo=$HOME/my-flatpak-builds app org.gnome.Builder.json
-   $ flatpak install --user my-flatpak-builds org.gnome.Builder
-
-.. note:: After following these steps once you can omit adding the remote or creating the app directory. 
You'll also need to add the ``--force-clean`` option to flatpak-builder and use ``flatpak update`` rather 
than ``flatpak install``.
-
 .. _via-jhbuild:
 
 via JHBuild