[llvm] [llvm-cov] Add HTML dark theme support (PR #93080)

[via llvm-commits]

EdJoPaTo wrote:

I am not sure a simple "Ping" would do much as there are no participants yet? Also, @llvmbot has not labeled this PR like it did others (probably because the infrequent additions to llvm-cov?)

@efriedma-quic is in the moment of writing the last one to commit to this repo so I "randomly" choose you asking for steps to continue with this PR. Maybe you can point me in a good direction? :)

https://github.com/llvm/llvm-project/pull/93080