add dep graph dot graphs (#1601)

docs/graphs/.gitignore

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+# do not track rendered graphs
+*.png

docs/graphs/dependency-graphs.md

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+# Actix Ecosystem Dependency Graphs
+
+See rendered versions of these dot graphs [on the wiki](https://github.com/actix/actix-web/wiki/Dependency-Graph).
+
+## Rendering
+
+Dot graphs were rendered using the `dot` command from [GraphViz](https://www.graphviz.org/doc/info/command.html):
+
+```sh
+for f in $(ls docs/graphs/*.dot | xargs); do dot $f -Tpng -o${f:r}.png; done
+```

docs/graphs/net-only.dot

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+digraph {
+    subgraph cluster_net {
+        label="actix/actix-net";
+        "actix-codec"
+        "actix-connect"
+        "actix-macros"
+        "actix-rt"
+        "actix-server"
+        "actix-service"
+        "actix-testing"
+        "actix-threadpool"
+        "actix-tls"
+        "actix-tracing"
+        "actix-utils"
+        "actix-router"
+    }
+
+    "actix-utils" -> { "actix-service" "actix-rt" "actix-codec" }
+    "actix-tracing" -> { "actix-service" }
+    "actix-tls" -> { "actix-service" "actix-codec" "actix-utils" "actix-rt" }
+    "actix-testing" -> { "actix-rt" "actix-macros" "actix-server" "actix-service" }
+    "actix-server" -> { "actix-service" "actix-rt" "actix-codec" "actix-utils" }
+    "actix-rt" -> { "actix-macros" "actix-threadpool" }
+    "actix-connect" -> { "actix-service" "actix-codec" "actix-utils" "actix-rt" }
+}

docs/graphs/web-focus.dot

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+digraph {
+    subgraph cluster_web {
+        label="actix/actix-web"
+        "awc"
+        "actix-web"
+        "actix-files"
+        "actix-http"
+        "actix-multipart"
+        "actix-web-actors"
+        "actix-web-codegen"
+    }
+
+    "actix-web" -> { "actix-codec" "actix-service" "actix-utils" "actix-router" "actix-rt" "actix-server" "actix-testing" "actix-macros" "actix-threadpool" "actix-tls" "actix-web-codegen" "actix-http" "awc" }
+    "awc" -> { "actix-codec" "actix-service" "actix-http" "actix-rt" }
+    "actix-web-actors" -> { "actix" "actix-web" "actix-http" "actix-codec" }
+    "actix-multipart" -> { "actix-web" "actix-service" "actix-utils" }
+    "actix-http" -> { "actix-service" "actix-codec" "actix-connect" "actix-utils" "actix-rt" "actix-threadpool" }
+    "actix-http" -> { "actix" "actix-tls" }[color=blue] // optional
+    "actix-files" -> { "actix-web" "actix-http" }
+
+    // net
+
+    "actix-utils" -> { "actix-service" "actix-rt" "actix-codec" }
+    "actix-tracing" -> { "actix-service" }
+    "actix-tls" -> { "actix-service" "actix-codec" "actix-utils" "actix-rt" }
+    "actix-testing" -> { "actix-rt" "actix-macros" "actix-server" "actix-service" }
+    "actix-server" -> { "actix-service" "actix-rt" "actix-codec" "actix-utils" }
+    "actix-rt" -> { "actix-macros" "actix-threadpool" }
+    "actix-connect" -> { "actix-service" "actix-codec" "actix-utils" "actix-rt" }
+}

docs/graphs/web-only.dot

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+digraph {
+    subgraph cluster_web {
+        label="actix/actix-web"
+        "awc"
+        "actix-web"
+        "actix-files"
+        "actix-http"
+        "actix-multipart"
+        "actix-web-actors"
+        "actix-web-codegen"
+    }
+
+    "actix-web" -> {  "actix-web-codegen" "actix-http" "awc" }
+    "awc" -> { "actix-http" }
+    "actix-web-actors" -> { "actix" "actix-web" "actix-http" }
+    "actix-multipart" -> { "actix-web" }
+    "actix-http" -> { "actix" }[color=blue] // optional
+    "actix-files" -> { "actix-web" "actix-http" }
+}