Remove unused package reference and add solution-level properties

Author: jaybarden1

AStar.Web.slnx

@@ -1,5 +1,7 @@
 <Solution>
-    <Folder Name="/Solution Items/"/>
+    <Folder Name="/Solution Items/">
+        <File Path="Directory.Build.props"/>
+    </Folder>
     <Folder Name="/Solution Items/.github/">
         <File Path=".github\codeql.yml"/>
         <File Path=".github\copilot-instructions.md"/>

src/uis/AStar.Dev.Web/AStar.Dev.Web.csproj

@@ -1,9 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
     <PropertyGroup>
-        <TargetFramework>net10.0</TargetFramework>
-        <ImplicitUsings>enable</ImplicitUsings>
-        <Nullable>enable</Nullable>
         <Deterministic>true</Deterministic>
         <ContinuousIntegrationBuild>true</ContinuousIntegrationBuild>
         <UserSecretsId>d7e61e34-084f-4c2b-9be8-5925170dc3b7</UserSecretsId>
@@ -28,7 +25,6 @@
         <PackageReference Include="Testably.Abstractions.FileSystem.Interface" Version="10.0.0"/>
         <PackageReference Include="Microsoft.Extensions.Http.Resilience" Version="10.0.0"/>
         <PackageReference Include="NetEscapades.AspNetCore.SecurityHeaders" Version="1.2.0"/>
-        <PackageReference Include="AStar.Dev.Source.Generators" Version="0.2.6-alpha"/>
     </ItemGroup>
 
     <ItemGroup>