Add the client script while index.html is served

Writing the tag into index.html on disk fails on most fresh installs
(linuxserver image, distro packages, Docker as a normal user) because
the web files belong to root. A middleware now adds the tag to the
response instead, so the ShareLink action and the guest lockdown work
right after install. The on-disk edit stays as a best-effort extra, and
the tag uses a relative src so it also works under a base URL.

Bump to 1.0.8.0.

Jellyfin.Plugin.ShareLinks/Jellyfin.Plugin.ShareLinks.csproj

@@ -6,9 +6,9 @@
     <LangVersion>latest</LangVersion>
     <RootNamespace>Jellyfin.Plugin.ShareLinks</RootNamespace>
     <AssemblyName>Jellyfin.Plugin.ShareLinks</AssemblyName>
-    <Version>1.0.7.0</Version>
-    <AssemblyVersion>1.0.7.0</AssemblyVersion>
-    <FileVersion>1.0.7.0</FileVersion>
+    <Version>1.0.8.0</Version>
+    <AssemblyVersion>1.0.8.0</AssemblyVersion>
+    <FileVersion>1.0.8.0</FileVersion>
     <GenerateAssemblyInfo>true</GenerateAssemblyInfo>
     <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
     <ImplicitUsings>disable</ImplicitUsings>