Reid Kleckner bdc65804e4 Revert "[Docs] Migrate LLVM docs to furo" (#208619) ...

Reverts llvm/llvm-project#184440

Furo seems to parse the entire navtree HTML blob for every page, and the
navtree is large, so now doc building takes > 25min. I wasn't able to
fix forward, so let's roll back for now.

Agent analysis here:
https://gist.github.com/rnk/5e26e09fbf1f51a501e6ab4139d048ad

2026-07-10 04:45:43 +00:00

..

GitHubMove.rst

…

TestSuite.rst

…

VariableNames.rst

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VectorPredication.rst

…