avo: add page (#6483)

pages/common/avo.md

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+# avo
+
+> The official command-line interface for Avo.
+> More information: <https://www.avo.app/docs/implementation/cli>.
+
+- Initialize a workspace in the current directory:
+
+`avo init`
+
+- Log into the Avo platform:
+
+`avo login`
+
+- Switch to an existing Avo branch:
+
+`avo checkout {{branch_name}}`
+
+- Pull analytics wrappers for the current path:
+
+`avo pull`
+
+- Display the status of the Avo implementation:
+
+`avo status`
+
+- Resolve Git conflicts in Avo files:
+
+`avo conflict`
+
+- Open the current Avo workspace in the default web browser:
+
+`avo edit`
+
+- Display help for a subcommand:
+
+`avo {{subcommand}} --help`