[flang-commits] [flang] [flang][docs] Use Furo theme (PR #223151)

[Tarun Prabhu via flang-commits]

https://github.com/tarunprabhu commented:

Thanks. I have posted this in on the Flang slack channel to see if the community has any objections to changing the theme.

https://github.com/llvm/llvm-project/pull/223151