glab-auth: Add page

pages/common/glab-auth.md

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+# glab auth
+
+> Authenticate with a GitLab host from the command-line.
+> More information: <https://glab.readthedocs.io/en/latest/auth/index.html#synopsis>.
+
+- Log in with interactive prompt:
+
+`glab auth login`
+
+- Log in with a token from standard input (created in https://gitlab.com/-/profile/personal_access_tokens):
+
+`echo {{your_token}} | glab auth login --stdin`
+
+- Check if you are logged in:
+
+`glab auth status`
+
+- Log in with a specific GitLab instance:
+
+`glab auth login --hostname {{gitlab.example.com}}`