docs: add Vale rules suggesting alternatives to animal-derived idioms

[stuckvgn]

Summary

Adds a small set of Vale substitution rules that suggest more precise alternatives to common animal-derived idioms in documentation.

For example:

• "kill two birds with one stone" → "accomplish two things at once"
• "guinea pig" → "test subject"
• "wild goose chase" → "pointless pursuit"
• "red herring" → "false lead"

The suggested alternatives are often more descriptive and clearer for non-native English speakers, while also avoiding phrases that casually reference animal harm.

Details

Two rule files added under docs/codeql/vale-styles/Speciesism/:

• AnimalIdioms.yml — 26 substitution patterns for common violent idioms
• AnimalMetaphors.yml — 8 substitution patterns for objectifying metaphors

All rules are set to suggestion level — they only surface alternatives during writing and won't affect CI or block any workflows.

Context

A growing number of documentation projects are adding speciesism-aware language rules to their Vale configurations (webpack.js.org, Elastic, Datadog, and others), following the same trajectory as the shift from master/slave → primary/replica and whitelist/blacklist → allowlist/blocklist.

The CodeQL docs already enable Microsoft.Gender — this extends that same attention to inclusive language.

References: Peer-reviewed paper on speciesist language

Changes

• Added docs/codeql/vale-styles/Speciesism/AnimalIdioms.yml
• Added docs/codeql/vale-styles/Speciesism/AnimalMetaphors.yml
• Updated docs/codeql/.vale.ini to include Speciesism in BasedOnStyles