restructure codeql docs

docs/codeql/codeql-cli/codeql-cli-reference.rst

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+.. _codeql-cli-reference:
+
+CodeQL CLI reference
+====================
+
+Learn more about the files you can use when running CodeQL processes and the results format and exit codes that CodeQL generates. 
+
+.. toctree::
+   :titlesonly:
+   :hidden:
+
+   about-ql-packs
+   query-reference-files
+   sarif-output
+   exit-codes
+
+
+- :doc:`About QL packs <about-ql-packs>`: QL packs are used to organize the files used in CodeQL analysis. They
+  contain queries, library files, query suites, and important metadata. 
+- :doc:`Query reference files <query-reference-files>`: A query reference file is text file that defines the location of one query to test.
+- :doc:`SARIF output <sarif-output>`: CodeQL supports SARIF as an output format for sharing static analysis results.
+- :doc:`Exit codes <exit-codes>`: The CodeQL CLI reports the status of each command it runs as an exit code.
+  This exit code provides information for subsequent commands or for other tools that rely on the CodeQL CLI.
+
+.. _cli-commands:
+
+CodeQL CLI manual
+-----------------
+
+To view detailed information about each CodeQL CLI command,
+including its usage and options, add the ``--help`` flag or visit the "`CodeQL CLI manual <../codeql-cli-manual>`__."