fix: remove all remaining mistralrs-server references

Drop Obsoletes/Provides for the old package name and update readme
and UI to use mistralrs-cuda13 consistently.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/pages/Home.tsx

@@ -15,8 +15,8 @@ export function Home() {
     <>
       <h1 className="mb-3">rpm.lair.cafe</h1>
       <p className="lead mb-4">
-        Self-hosted RPM repository for Fedora, currently hosting CUDA-accelerated
-        builds of{" "}
+        Self-hosted RPM repository for Fedora, currently hosting
+        CUDA-accelerated builds of{" "}
         <a href="https://github.com/EricLBuehler/mistral.rs">mistral.rs</a>.
       </p>
 
@@ -33,7 +33,7 @@ export function Home() {
 
               <h6 className="mt-4">2. Add the repository</h6>
               <CodeBlock language="bash">
-                {`sudo tee /etc/yum.repos.d/lair-cafe.repo > /dev/null <<'EOF'\n${REPO_FILE}\nEOF`}
+                {`sudo dnf config-manager addrepo --from-repofile=/dev/stdin <<'EOF'\n${REPO_FILE}\nEOF`}
               </CodeBlock>
 
               <h6 className="mt-4">3. Install a package</h6>