chore: add .gitignore to gh-pages branch (#3568)

.gitignore

@@ -0,0 +1,29 @@
+.DS_Store
+.nyc_output
+*.lcov
+/coverage
+dist
+docs
+doc
+node_modules
+lerna-debug.log
+yarn-error.log
+packages/**/.npmignore
+packages/**/tsconfig.json
+!packages/template/*/tmpl/tsconfig.json
+packages/**/tslint.json
+packages/**/yarn.lock
+packages/*/*/index.ts
+packages/.old
+packages/utils/types/index.d.ts
+packages/api/cli/README.md
+!packages/**/base/README.md
+!/README.md
+packages/**/tsconfig.tsbuildinfo
+packages/**/.swc
+.webpack
+packages/api/core/test/fixture/app-with-scoped-name/out/make
+packages/plugin/webpack/test/fixtures/apps/native-modules/package-lock.json
+packages/plugin/fuses/test/fixture/app
+.links
+reports