fix: shorter doc nav section titles

A few of the section titles in the doc nav are long, which makes it harder to scan
for a topic. Worse, some of these wrap to two lines making the layout not flow very
well.

Signed-off-by: Tim deBoer <git@tdeboer.ca>

website/docs/compose/index.md

@@ -1,6 +1,6 @@
 ---
 sidebar_position: 35
-title: Working with Compose
+title: Compose
 description: With Podman Desktop, you can install a Compose engine and manage multi-container applications defined in Compose files.
 keywords: [compose]
 tags: [compose]

website/docs/containers/index.md

@@ -1,6 +1,6 @@
 ---
 sidebar_position: 30
-title: Working with containers
+title: Containers
 description: Working with container workloads
 tags: [podman-desktop, containers]
 keywords: [podman desktop, podman, containers]

website/docs/installation/index.md

@@ -1,6 +1,6 @@
 ---
 sidebar_position: 2
-title: Installing Podman Desktop
+title: Installing
 description: You can install Podman Desktop on Windows, macOS, and Linux.
 tags: [podman-desktop, installing]
 keywords: [podman desktop, containers, podman, installing, installation]

website/docs/kubernetes/index.md

@@ -1,6 +1,6 @@
 ---
 sidebar_position: 60
-title: Working with Kubernetes
+title: Kubernetes
 description: Migrate transparently from Podman to Kubernetes, and continue using familiar workflows.
 keywords: [podman desktop, podman, containers, migrating, kubernetes]
 tags: [migrating-to-kubernetes]

website/docs/proxy/index.md

@@ -1,6 +1,6 @@
 ---
 sidebar_position: 2
-title: In a restricted environment
+title: Restricted environments
 description: Using Podman Desktop behind a proxy requiring custom Certificate Authorities (CA).
 tags: [podman-desktop, installing, windows, macos, linux]
 keywords: [podman desktop, containers, podman, installing, installation, windows, macos, linux]