feat(lang): add alias dockerfile -> docker

[ezracelli]

Adds an alias language ID dockerfile for language ID docker. This provides parity with GHFM (which actually doesn’t support docker, only dockerfile), GLFM, and Prism

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• N/A — Add a test if possible
• Format all commit messages with Conventional Commits

• I have read docs for adding a language.
• N/A — I have searched around and this is the most up-to-date, actively maintained version of the language grammar.
• N/A — I have added a sample file that includes a variety of language syntaxes and succinctly captures the idiosyncrasy of a language. See docs for requirement.

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[ezracelli]

NB: This was the only change made manually, all other changes were made automatically by ./scripts/grammars/updateGrammarSourceFiles.ts

[ezracelli]

Not sure why CI is failing here, looks like playwright is complaining about a version mismatch? Bit out of my wheelhouse, but doesn’t seem like this PR should have touched anything related to that 😅

[octref]

Sorry, fixed CI and rebased.

[octref]

Can't push the rebase change to your branch – next time can you check the box that "allows maintainers to push"?
The current changes are minimal and look good, so I'll just merge it now.