doc: add 'Architecture' article to admin section

Herein we add some hints and suggestions about typical architectures of
searx infrastructures.  We start with a contribution from @dalf

- https://github.com/asciimoo/searx/pull/1776#issuecomment-567917320

thanks @dalf !!

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

1 files changed, 24 insertions, 0 deletions

diff --git a/docs/admin/architecture.rst b/docs/admin/architecture.rst
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+.. _architecture:
+
+============
+Architecture
+============
+
+.. sidebar:: Needs work!
+
+   This article needs some work / Searx is a collaborative effort.  If you have
+   any contribution, feel welcome to send us your :pull:`PR <../pulls>`, see
+   :ref:`how to contribute`.
+
+Herein you will find some hints and suggestions about typical architectures of
+searx infrastructures.
+
+We start with a contribution from :pull:`@dalf <1776#issuecomment-567917320>`.
+It shows a *reference* setup for public searx instances.
+
+.. _arch public:
+
+.. kernel-figure:: arch_public.dot
+   :alt: arch_public.dot
+
+   Reference architecture of a public searx setup.