docs: update 1.21.1 NeoForge build to 21.1.259 (v1.2.0)
docs: update version tables to match gradle.properties Sync wiki versions with current gradle.properties values across all Minecraft/loader branches and add the missing credits footer.
docs: keep the attribution footer only in _Footer The GitHub wiki was generated from the GitLab one, which repeats the attribution at the end of every page. GitHub renders _Footer.md automatically, so every page showed the notice twice. Regenerated from guide/tools/build_guide.py, which emits the footer once, matching the documented GitHub format. Co-Authored-By: Claude <noreply@anthropic.com>
docs: add versions of every branch, commands and credits pages Co-Authored-By: Claude <noreply@anthropic.com>
docs: add Equivalent Legacy player guide (English and Spanish) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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