Clean up release process readme (#7182)

* Clean up release process readme

* Update CONTRIBUTING.md

Co-authored-by: graphite-app[bot] <96075541+graphite-app[bot]@users.noreply.github.com>

---------

Co-authored-by: graphite-app[bot] <96075541+graphite-app[bot]@users.noreply.github.com>

scripts/semantic-release.sh

@@ -1,43 +0,0 @@
-#!/bin/bash
-set -euo pipefail
-
-# Fetch the latest release tag
-git fetch --all --tags
-latest_tag=$(git tag --sort=-v:refname | grep "^v[0-9]" | head -n 1)
-
-# Function to bump version numbers
-bump_version() {
-  local version=$1
-  local bump_type=$2
-  local major=$(echo $version | cut -d '.' -f 1 | sed 's/v//')
-  local minor=$(echo $version | cut -d '.' -f 2)
-  local patch=$(echo $version | cut -d '.' -f 3)
-
-  case "$bump_type" in
-    major)
-      major=$((major + 1))
-      minor=0
-      patch=0
-      ;;
-    minor)
-      minor=$((minor + 1))
-      patch=0
-      ;;
-    *)
-      patch=$((patch + 1))
-      ;;
-  esac
-
-  echo "v${major}.${minor}.${patch}"
-}
-
-# Determine the type of bump based on the argument
-bump_type=${1:-minor}
-
-# Bump the version
-new_version=$(bump_version $latest_tag $bump_type)
-
-# Print the new semver tag
-# Example output v0.27.1
-# Yes it will include the v at the start
-echo $new_version