Manual links in C extension are broken

E.g. c.sdsp https://luplab.gitlab.io/rvcodecjs/#q=c.sdsp&abi=false&isa=AUTO

"Manual = " link is https://riscv-software-src.github.io/riscv-unified-db/manual/html/isa/isa_20240411/insts/c.sdsp.html which gives github's 404