V14: Rename new projects (#15836)

* Rename Web.UI.New back to Web.UI

* Delete new backoffiec folder

* Rename client project

* Add new submodule

* Update template csproj

* Remove more mentions of new

* Add missing views

* Moving up the "Umbraco.Web.UI" proj reference, so that it is the first project listed in solution file (.sln) since it will be selected as startup one in VS by default.

* don't include grid

* Update with section of how to get started with backoffice

* Update .github/BUILD.md

Co-authored-by: Elitsa Marinovska <21998037+elit0451@users.noreply.github.com>

* Add line about white page

---------

Co-authored-by: Elitsa <elm@umbraco.dk>
Co-authored-by: Elitsa Marinovska <21998037+elit0451@users.noreply.github.com>

src/Umbraco.Web.UI/appsettings.Development.template.json

@@ -0,0 +1,47 @@
+{
+  "$schema" : "./appsettings-schema.json",
+  "Serilog": {
+    "MinimumLevel": {
+      "Default": "Information",
+      "Override": {
+        "Examine.Lucene.Providers.LuceneIndex": "Debug",
+        "Examine.BaseIndexProvider": "Debug",
+        "Examine.Lucene.LoggingReplicationClient": "Debug",
+        "Examine.Lucene.ExamineReplicator": "Debug"
+      }
+    },
+    "WriteTo": [
+      {
+        "Name": "Async",
+        "Args": {
+          "configure": [
+            {
+              "Name": "Console"
+            }
+          ]
+        }
+      }
+    ]
+  },
+  "Umbraco": {
+    "CMS": {
+      "Examine": {
+        "LuceneDirectoryFactory": "TempFileSystemDirectoryFactory"
+      },
+      "Global": {
+        "Smtp": {
+          //"From": "your@email.here",
+          //"Host": "localhost",
+          // "Port": "25"
+        }
+      },
+      "Hosting": {
+        "Debug": true
+      },
+      "RuntimeMinification": {
+        "useInMemoryCache": true,
+        "cacheBuster": "Timestamp"
+      }
+    }
+  }
+}