[mod] docs: add acknowledgements section (#5449)

* [mod] docs: add acknowledgements section

Moves all images into a `assets/` folder.

* [fix] docs: normalize brands svg

docs/admin/answer-captcha.rst

@@ -48,7 +48,7 @@ solve the CAPTCHA from `qwant.com <https://www.qwant.com/>`__.
 
   .. group-tab:: Firefox
 
-     .. kernel-figure:: answer-captcha/ffox-setting-proxy-socks.png
+     .. kernel-figure:: /assets/answer-captcha/ffox-setting-proxy-socks.png
         :alt: FFox proxy on SOCKS5, 127.0.0.1:8080
 
         Firefox's network settings
@@ -66,4 +66,3 @@ solve the CAPTCHA from `qwant.com <https://www.qwant.com/>`__.
 
    -N
       Do not execute a remote command.  This is useful for just forwarding ports.
-

docs/assets/sponsors/tuta.svg

@@ -0,0 +1 @@
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docs/index.rst

@@ -56,4 +56,34 @@ If you don't trust anyone, you can set up your own, see :ref:`installation`.
    utils/index
    src/index
 
+
+----------------
+Acknowledgements
+----------------
+
+The following organizations have provided SearXNG access to their paid plans at
+no cost:
+
+.. flat-table::
+   :widths: 1 1
+
+   * - .. image:: /assets/sponsors/docker.svg
+          :target: https://docker.com
+          :alt: Docker
+          :align: center
+          :height: 100 px
+
+     - .. image:: /assets/sponsors/tuta.svg
+          :target: https://tuta.com
+          :alt: Tuta
+          :align: center
+          :height: 100 px
+
+   * - .. image:: /assets/sponsors/browserstack.svg
+          :target: https://browserstack.com
+          :alt: BrowserStack
+          :align: center
+          :height: 100 px
+
+
 .. _searx.space: https://searx.space