[doc] build from commit 6dab7fe78be3c8872b8a6d99cf00c597813171bagh-pages

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+digraph G {
+
+  node [style=filled, shape=box, fillcolor="#ffffcc", fontname=Sans];
+  edge [fontname="Sans"];
+
+  browser [label="browser", shape=tab, fillcolor=aliceblue];
+  rp      [label="reverse proxy"];
+  static  [label="static files", shape=folder, href="url to configure static files", fillcolor=lightgray];
+  uwsgi   [label="uwsgi", shape=parallelogram href="https://docs.searxng.org/utils/searx.sh.html"]
+  redis     [label="redis DB", shape=cylinder];
+  searxng1  [label="SearXNG #1", fontcolor=blue3];
+  searxng2  [label="SearXNG #2", fontcolor=blue3];
+  searxng3  [label="SearXNG #3", fontcolor=blue3];
+  searxng4  [label="SearXNG #4", fontcolor=blue3];
+
+  browser -> rp [label="HTTPS"]
+
+  subgraph cluster_searxng {
+      label = "SearXNG instance" fontname=Sans;
+      bgcolor="#fafafa";
+      { rank=same; static rp };
+      rp -> static  [label="optional: reverse proxy serves static files", fillcolor=slategray, fontcolor=slategray];
+      rp -> uwsgi [label="http:// (tcp) or unix:// (socket)"];
+      uwsgi -> searxng1 -> redis;
+      uwsgi -> searxng2 -> redis;
+      uwsgi -> searxng3 -> redis;
+      uwsgi -> searxng4 -> redis;
+  }
+
+}