Update "About CodeQL" to cover the information needs of security researchers better

[felicitymay]

When this article was originally written, it needed to be all things to all people. Now that the CodeQL docs site is firmly focused on security researchers and anyone else who wants to learn how to write CodeQL queries, we can make the content more focused.

These updates aim to answer the following needs of security researchers:

• Determine if the effort of learning CodeQL is balanced by the additional opportunities to find vulnerabilities
• Identify a quick way to learn the language.
• Test my new query so I can report vulnerabilities and get them fixed/get bounty.

In addition, I've added metadata keywords to this article and the new article introduced by:

• Update the Docs landing page for the CodeQL docs site #17361

This are intended to aid discoverability and we'll check the data analytics a month or so after publication to determine whether they are having the expected impact on SEO.

Questions for reviewers

• Is there anything missing from the revised article?
• If you're a security researcher, what would you want to see in this article?

[SiaraMist]

👋 Hey @felicitymay! I'm first responding this week and based on the FR instructions I think a technical review is needed before I put it on the review board? Are you okay to move this forward as needed?

[subatoi]

Thanks for these updates! Everything looks good purely from a language point of view.

[subatoi]

Suggested change

For information on the CodeQL toolchain and on running CodeQL to analyze a codebase, see the `CodeQL CLI <https://docs.github.com/en/code-security/codeql-cli>`__, `CodeQL for Visual Studio Code <https://docs.github.com/en/code-security/codeql-for-vs-code>`__, and `About code scanning with CodeQL <https://docs.github.com/en/code-security/code-scanning/introduction-to-code-scanning/about-code-scanning-with-codeql>`__ in GitHub docs.

For information on the CodeQL toolchain and on running CodeQL to analyze a codebase, see the `CodeQL CLI <https://docs.github.com/en/code-security/codeql-cli>`__, `CodeQL for Visual Studio Code <https://docs.github.com/en/code-security/codeql-for-vs-code>`__, and `About code scanning with CodeQL <https://docs.github.com/en/code-security/code-scanning/introduction-to-code-scanning/about-code-scanning-with-codeql>`__ in the GitHub docs.

Super minor