[libc][docs] add redirect for math/index.html (#120274)

commit a9aff440d9dd ("[libc][docs] reorganize documentation (#118836)")

moved https://libc.llvm.org/math/index.html to
https://libc.llvm.org/headers/math/index.html which makes links from
various slide decks stale.

There's an extension for sphinx that can generate redirects. Add a dependency
on that, then use it to create a redirect so that those older links still work.

I was able to install this sphinx extension via:

    $ sudo apt install python3-sphinx-reredirects

We may need to install this on whatever server generates the llvm
documentation.
2 files changed
tree: eb35584d3001c407ea52671c6d9779c3b8a68fef
  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
  10. libc/
  11. libclc/
  12. libcxx/
  13. libcxxabi/
  14. libunwind/
  15. lld/
  16. lldb/
  17. llvm/
  18. llvm-libgcc/
  19. mlir/
  20. offload/
  21. openmp/
  22. polly/
  23. pstl/
  24. runtimes/
  25. third-party/
  26. utils/
  27. .clang-format
  28. .clang-tidy
  29. .git-blame-ignore-revs
  30. .gitattributes
  31. .gitignore
  32. .mailmap
  33. CODE_OF_CONDUCT.md
  34. CONTRIBUTING.md
  35. LICENSE.TXT
  36. pyproject.toml
  37. README.md
  38. SECURITY.md
README.md

The LLVM Compiler Infrastructure

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