fix(build): remove .cargo/config.toml to make docs.rs happy

.cargo/config.toml

-# Add the contents of this file to `config.toml` to enable "fast build" configuration. Please read the notes below.
-
-# NOTE: For maximum performance, build using a nightly compiler
-# If you are using rust stable, remove the "-Zshare-generics=y" below (as well as "-Csplit-debuginfo=unpacked" when building on macOS).
-
-[target.x86_64-unknown-linux-gnu]
-linker = "/usr/bin/clang"
-rustflags = ["-Clink-arg=-fuse-ld=lld"]
-
-# NOTE: you must manually install https://github.com/michaeleisel/zld on mac. you can easily do this with the "brew" package manager:
-# `brew install michaeleisel/zld/zld`
-[target.x86_64-apple-darwin]
-rustflags = ["-C", "link-arg=-fuse-ld=/usr/local/bin/zld"]
-
-[target.x86_64-pc-windows-msvc]
-linker = "rust-lld.exe"
-rustflags = []
-
-# Optional: Uncommenting the following improves compile times, but reduces the amount of debug info to 'line number tables only'
-# In most cases the gains are negligible, but if you are on macos and have slow compile times you should see significant gains.
-#[profile.dev]
-#debug = 1