chore: remove changelog generator [ci skip]

Author: levithomason

package.json

@@ -15,17 +15,14 @@
   "sideEffects": false,
   "scripts": {
     "build": "cross-env NODE_ENV=production gulp build",
-    "build:changelog": "github_changelog_generator --user Semantic-Org --project Semantic-UI-React --no-issues --no-unreleased --release-branch master --since-tag $(git describe --abbrev=0 --tags $(git rev-parse HEAD~250))",
     "build:docs": "cross-env NODE_ENV=production gulp build:docs",
     "build:docs:staging": "cross-env STAGING=true yarn build:docs && yarn serve docs/dist",
     "build:dist": "gulp build:dist",
     "prebuild:size": "gulp build:dist:es",
     "build:size": "node bundle-size/bundle.js",
     "ci": "yarn tsd:test && yarn lint && yarn test",
     "predeploy:docs": "cross-env NODE_ENV=production yarn build:docs && gulp build:docs:cname",
-    "deploy:changelog": "git add CHANGELOG.md && git commit -m \"docs(changelog): update changelog [ci skip]\" && git push",
     "deploy:docs": "gulp deploy:docs",
-    "postdeploy:docs": "yarn build:changelog && yarn deploy:changelog",
     "lint": "cross-env NODE_ENV=production eslint . --ext .js,.ts,.tsx",
     "lint:fix": "yarn lint --fix",
     "prettier": "prettier --list-different \"**/*.{js,jsx,ts,tsx}\"",