Add more default display options html tags

Author: kMutagene

src/Plotly.NET/ChartAPI/GenericChart.fs

@@ -56,7 +56,6 @@ type HTML() =
 
         html [] [
             head [] [
-                meta [_charset "UTF-8"]
                 plotlyScriptRef
                 yield! additionalHeadTags
             ]

src/Plotly.NET/Defaults.fs

@@ -7,7 +7,7 @@ open DynamicObj
 open DynamicObj.Operators
 open System.Runtime.InteropServices
 
-
+open Giraffe.ViewEngine
 /// Contains mutable global default values.
 ///
 /// Changing these values will apply the default values to all consecutive Chart generations.
@@ -23,7 +23,21 @@ module Defaults =
     let mutable DefaultConfig =
         Config.init (Responsive = true)
 
-    let mutable DefaultDisplayOptions = DisplayOptions.initCDNOnly()
+    let mutable DefaultDisplayOptions = 
+        DisplayOptions.init(
+            PlotlyJSReference = CDN $"https://cdn.plot.ly/plotly-{Globals.PLOTLYJS_VERSION}.min.js",
+            AdditionalHeadTags = [
+                title [] [str "Plotly.NET Datavisualization"]
+                meta [_charset "UTF-8"]
+                meta [_name "description"; _content "A plotly.js graph generated with Plotly.NET"]
+                link [
+                    _id "favicon"
+                    _rel "shortcut icon"
+                    _type "image/png"
+                    _href $"data:image/png;base64,{Globals.LOGO_BASE64}"
+                ]
+            ]
+        )
 
     /// The default chart template. Default: ChartTemplates.plotly
     let mutable DefaultTemplate =

src/Plotly.NET/Globals.fs

@@ -40,6 +40,9 @@ else {
 }
 """
 
+/// base64 encoded favicon logo for generated htmls
+let [<Literal>] LOGO_BASE64 = """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"""
+
 /// 
 let internal JSON_CONFIG = 
     JsonSerializerSettings(