update README, remove buildifier

.envrc

@@ -4,15 +4,12 @@ BIN_DIR="$(git rev-parse --show-toplevel)/bin"
 export PATH="$BIN_DIR:$PATH"
 
 _u_bzl=https://github.com/bazelbuild/bazelisk/releases/download/v1.12.0/bazelisk-
-_u_bldf=https://github.com/bazelbuild/buildtools/releases/download/5.1.0/buildifier-
 
 if [[ "${PRINT_TOOL_HASHES:-no}" = "yes" ]]; then
     for os in linux darwin; do
         for arch in amd64 arm64; do
             hash_bzl=$(direnv fetchurl "${_u_bzl}$os-$arch")
-            hash_bldf=$(direnv fetchurl "${_u_bldf}$os-$arch")
             echo -e "bzl:  $os-$arch\t$hash_bzl"
-            echo -e "bldf: $os-$arch\t$hash_bldf"
         done
     done
 fi
@@ -22,19 +19,15 @@ fi
 case "$(uname | tr A-Z a-z)-$(uname -m)" in
     linux-x86_64)
         bzl=$(direnv fetchurl "${_u_bzl}linux-amd64" sha256-awvLLqFbyhb/+r5v2nWANEA3U1TAhUgP42HSy/MlAds=)
-        bldf=$(direnv fetchurl "${_u_bldf}linux-amd64" sha256-Ur9rECy0+IRk4ZfKrAbWl5P6KwX1rVCn579vvWVmSKM=)
         ;;
     linux-aarch64)
         bzl=$(direnv fetchurl "${_u_bzl}linux-arm64" sha256-KdhhykjfJKPo3sV/sAUIumZKMZIQR7JobDjPmiDUY58=)
-        bldf=$(direnv fetchurl "${_u_bldf}linux-arm64" sha256-kX1ZnbsEDmOuen4a23ENIFeBGQL9yeNczpJev9lm7rg=)
         ;;
     darwin-x86_64)
         bzl=$(direnv fetchurl "${_u_bzl}darwin-amd64" sha256-cM9/50gI0WQY03H+uMzU58RCFdsD0sT/x1t2e3ZUCfs=)
-        bldf=$(direnv fetchurl "${_u_bldf}darwin-amd64" sha256-yTeNn0KT/DjsVKCPvHTnqdKJFNrmiRM0QB5Z849uZdw=)
         ;;
     darwin-arm64)
         bzl=$(direnv fetchurl "${_u_bzl}darwin-arm64" sha256-NFu4uQDWue90I06enkE67Tj7Ke8lXkrhisYb9KYQLYQ=)
-        bldf=$(direnv fetchurl "${_u_bldf}darwin-arm64" sha256-dF/rXqlstv85p2soIcV1kf1wtSgyVWJIbUe10IkA4uQ=)
         ;;
     *)
         >&2 echo "unsupported architecture tuple $(uname | tr A-Z a-z)-$(uname -m)"
@@ -42,4 +35,3 @@ case "$(uname | tr A-Z a-z)-$(uname -m)" in
 esac
 
 ln -sf "${bzl}" "$BIN_DIR/bazel"
-ln -sf "${bldf}" "$BIN_DIR/buildifier"