Remove outdated npm scripts.

Author: DavidAnson

package.json

@@ -30,12 +30,9 @@
     "build-docker-image": "VERSION=$(node -e \"process.stdout.write(require('./package.json').version)\") && docker build -t davidanson/markdownlint-cli2:v$VERSION -f docker/Dockerfile --label org.opencontainers.image.version=v$VERSION .",
     "build-docker-image-rules": "VERSION=$(node -e \"process.stdout.write(require('./package.json').version)\") && docker build -t davidanson/markdownlint-cli2-rules:v$VERSION -f docker/Dockerfile-rules --build-arg VERSION=v$VERSION --label org.opencontainers.image.version=v$VERSION .",
     "ci": "npm-run-all --continue-on-error --parallel test-cover lint schema",
-    "docker-npm-install": "docker run --rm --tty --name npm-install --volume $PWD:/home/workdir --workdir /home/workdir --user node node:latest npm install",
-    "docker-npm-run-upgrade": "docker run --rm --tty --name npm-run-upgrade --volume $PWD:/home/workdir --workdir /home/workdir --user node node:latest npm run upgrade",
     "lint": "eslint --max-warnings 0 --no-eslintrc --config .eslintrc.json .",
     "lint-dockerfile": "docker run --rm -i hadolint/hadolint:latest-alpine < docker/Dockerfile",
     "lint-watch": "git ls-files | entr npm run lint",
-    "publish-docker-image": "VERSION=$(node -e \"process.stdout.write(require('./package.json').version)\") && docker buildx build --platform linux/arm64,linux/amd64 -t davidanson/markdownlint-cli2:v$VERSION -t davidanson/markdownlint-cli2:latest -f docker/Dockerfile --push .",
     "schema": "cpy ./node_modules/markdownlint/schema/markdownlint-config-schema.json ./schema --flat",
     "test": "ava --timeout=1m test/append-to-array-test.js test/fs-mock-test.js test/markdownlint-cli2-test.js test/markdownlint-cli2-test-exec.js test/markdownlint-cli2-test-fs.js test/markdownlint-cli2-test-main.js test/merge-options-test.js test/resolve-and-require-test.js",
     "test-cover": "c8 --100 npm test -- --concurrency=1",
@@ -46,7 +43,6 @@
     "test-invoke-as-cli": "markdownlint-cli2 CHANGELOG.md",
     "test-watch": "git ls-files | entr npm run test",
     "update-snapshots": "ava --timeout=1m --update-snapshots test/markdownlint-cli2-test-exec.js test/markdownlint-cli2-test-fs.js test/markdownlint-cli2-test-main.js",
-    "upgrade": "npx --yes npm-check-updates --upgrade",
     "webworker": "cd webworker && webpack --mode none",
     "webworker-install": "npm run docker-npm-install -- --no-save path-browserify process setimmediate stream-browserify url util webpack-cli"
   },