.NET 6 (#32)

- Convert back-end to .NET 6
- Upgrade Giraffe, convert routing to endpoint style
- Refactor code to take advantage of F# advances

src/PrayerTracker.UI/CommonFunctions.fs

@@ -2,8 +2,9 @@
 module PrayerTracker.Views.CommonFunctions
 
 open Giraffe
-open Giraffe.GiraffeViewEngine
+open Giraffe.ViewEngine
 open Microsoft.AspNetCore.Antiforgery
+open Microsoft.AspNetCore.Html
 open Microsoft.AspNetCore.Http
 open Microsoft.AspNetCore.Mvc.Localization
 open Microsoft.Extensions.Localization
@@ -125,6 +126,13 @@ let _onsubmit = attr "onsubmit"
 let _scoped = flag "scoped"
 
 
+/// The name this function used to have when the view engine was part of Giraffe
+let renderHtmlNode = RenderView.AsString.htmlNode
+
+/// Render an HTML node, then return the value as an HTML string
+let renderHtmlString = renderHtmlNode >> HtmlString
+
+
 /// Utility methods to help with time zones (and localization of their names)
 module TimeZones =