Update for version 1.8.0 (#6)

- Bump library version
- Bump htmx script version
- Add hx-replace-url / HX-Replace-Url
- Add hx-select-oob
- Change hx-push-url to accept a string
- Add HX-Push-Url, obsolete HX-Push
- Implement HX-Reswap header
- Rework project structure to add common project

src/ViewEngine.Htmx/Giraffe.ViewEngine.Htmx.fsproj

@@ -1,7 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <Description>Extensions to Giraffe View Engine to support htmx attributes and their values</Description>
     <PackageReadmeFile>README.md</PackageReadmeFile>
@@ -16,4 +15,8 @@
     <PackageReference Include="Giraffe.ViewEngine" Version="1.4.0" />
   </ItemGroup>
 
+  <ItemGroup>
+    <ProjectReference Include="..\Common\Giraffe.Htmx.Common.fsproj" />
+  </ItemGroup>
+
 </Project>