[skip CI] using TOML instead of YAML

docs/sample.toml

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+[options.placing]
+diagonals = false
+
+[options.rendering.icons]
+color = "#00695C"
+
+[options.rendering.links]
+color = "#26A69A"
+
+[options.rendering.texts]
+color = "#004D40"
+font = "mono"
+font-size = 12
+margin = 0.25
+
+[options.rendering.sub-icons]
+color = "#004D40"
+
+[[nodes]]
+name = "client"
+icon = "laptop"
+bottom = "user"
+
+[[nodes]]
+name = "page"
+icon = "file-code"
+top = "index.html"
+
+[[nodes]]
+name = "js"
+icon = "js-square"
+bottom = "front-end"
+
+[[nodes]]
+name = "server"
+icon = "node"
+bottom = "back-end"
+
+[[nodes]]
+name = "db"
+icon = "database"
+
+[[links]]
+from = "client"
+to = "page"
+
+[[links]]
+from = "page"
+to = "js"
+type = "double"
+bottom = "VueJS"
+direction = "down"
+
+  [links.top]
+  icon = "vuejs"
+
+[[links]]
+from = "js"
+to = "server"
+type = "split-double"
+direction = "right"
+
+  [links.top]
+  text = "Ajax"
+
+  [links.bottom]
+  text = "JSON"
+
+[[links]]
+from = "db"
+to = "server"
+type = "double"
+bottom = "Sequelize"