cockpit-*: add page (#9145)

pages/linux/cockpit-bridge.md

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+# cockpit-bridge
+
+> Relay messages and commands between the front end and server in the cockpit suite.
+> More information: <https://cockpit-project.org/guide/latest/cockpit-bridge.1.html>.
+
+- List all cockpit packages:
+
+`cockpit-bridge --packages`
+
+- Display help:
+
+`cockpit-bridge --help`

pages/linux/cockpit-desktop.md

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+# cockpit-desktop
+
+> Provides secure access to Cockpit pages in an already running session.
+> It starts `cockpit-ws` and a web browser in an isolated network space and a `cockpit-bridge` in a running user session.
+> More information: <https://cockpit-project.org/guide/latest/cockpit-desktop.1.html>.
+
+- Open a page:
+
+`cockpit-desktop {{url}} {{SSH_host}}`
+
+- Open storage page:
+
+`cockpit-desktop {{/cockpit/@localhost/storage/index.html}}`

pages/linux/cockpit-tls.md

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+# cockpit-tls
+
+> TLS terminating HTTP proxy to encrypt traffic between a client and `cockpit-ws`.
+> More information: <https://cockpit-project.org/guide/latest/cockpit-tls.8.html>.
+
+- Serve HTTP requests to a specific port instead of port `9090`:
+
+`cockpit-tls --port {{port}}`
+
+- Display help:
+
+`cockpit-tls --help`