Reintroduced barebones web.config

At minimum, the `OnTopic.Editor.Web` project needs a reference to `netstandard`. Without this, it will still compile, oddly, but will throw a lot of errors in code analysis due to the **IntelliSense**'s (?) inability to parse the **.NET Standard** libraries (e.g., `OnTopic`, `OnTopic.Web`). Keeping it in doesn't hurt anything, and remains smaller than the previous one we removed.

Author: JeremyCaney

OnTopic.Editor.Web/OnTopic.Editor.Web.csproj

@@ -1093,6 +1093,9 @@
     <Folder Include="Common\Scripts\Vendor\ExtJS\resources\images\vista\dd\" />
     <Folder Include="Common\Scripts\Vendor\ExtJS\resources\images\vista\tree\" />
   </ItemGroup>
+  <ItemGroup>
+    <Content Include="Web.config" />
+  </ItemGroup>
   <PropertyGroup>
     <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">10.0</VisualStudioVersion>
     <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>

OnTopic.Editor.Web/Web.config

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <system.web>
+    <compilation debug="true">
+      <assemblies>
+        <add assembly="netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51" />
+      </assemblies>
+    </compilation>
+  </system.web>
+</configuration>