copilot: add page; gh-copilot: add deprecation note (#19640)

pages/common/copilot.md

@@ -0,0 +1,32 @@
+# copilot
+
+> Interact with GitHub Copilot.
+> More information: <https://docs.github.com/en/copilot/concepts/agents/about-copilot-cli>.
+
+- Start interactive mode:
+
+`copilot`
+
+- Allow all file editing:
+
+`copilot --allow-tool write`
+
+- Resume the most recent session:
+
+`copilot --continue`
+
+- Resume a previous session using session picker:
+
+`copilot --resume`
+
+- Use a specific model:
+
+`copilot --model "{{gpt-5}}"`
+
+- Allow all Git commands except `git push`:
+
+`copilot --allow-tool 'shell(git:*)' --deny-tool 'shell(git push)'`
+
+- Execute a prompt directly without interactive mode, while allowing `copilot` to run any command:
+
+`copilot {{[-p|--prompt]}} "{{Fix the bug in main.js}}" --allow-all-tools`

pages/common/gh-copilot.md

@@ -1,6 +1,7 @@
 # gh copilot
 
 > Interact with GitHub Copilot.
+> Note: Deprecated in favor of `copilot`.
 > More information: <https://github.com/github/gh-copilot#usage>.
 
 - Suggest a command, given a description: