chore: improve 6.x docs build

Author: vkarpov15

package.json

@@ -80,7 +80,7 @@
     "docs:clean:6x": "rimraf index.html && rimraf -rf ./docs/6.x && rimraf -rf ./docs/source/_docs && rimraf -rf ./tmp",
     "docs:copy:tmp": "mkdirp ./tmp/docs/css && mkdirp ./tmp/docs/js && mkdirp ./tmp/docs/images && mkdirp ./tmp/docs/tutorials && mkdirp ./tmp/docs/typescript && mkdirp ./tmp/docs/api && ncp ./docs/css ./tmp/docs/css --filter=.css$ && ncp ./docs/js ./tmp/docs/js --filter=.js$ && ncp ./docs/images ./tmp/docs/images && ncp ./docs/tutorials ./tmp/docs/tutorials && ncp ./docs/typescript ./tmp/docs/typescript && ncp ./docs/api ./tmp/docs/api && cp index.html ./tmp && cp docs/*.html ./tmp/docs/",
     "docs:copy:tmp:5x": "rimraf ./docs/5.x && ncp ./tmp ./docs/5.x",
-    "docs:copy:6x:tmp": "cp -r ./docs/6.x ./docs/tmp",
+    "docs:move:6x:tmp": "mv ./docs/6.x ./docs/tmp",
     "docs:copy:tmp:6x": "rimraf ./docs/6.x && ncp ./tmp ./docs/6.x",
     "docs:checkout:gh-pages": "git checkout gh-pages",
     "docs:checkout:5x": "git checkout 5.x",
@@ -95,7 +95,7 @@
     "docs:view": "node ./scripts/static.js",
     "docs:prepare:publish:stable": "npm run docs:checkout:gh-pages && npm run docs:merge:stable && npm run docs:clean:stable && npm run docs:generate && npm run docs:generate:search",
     "docs:prepare:publish:5x": "npm run docs:checkout:5x && npm run docs:merge:5x && npm run docs:clean:stable && npm run docs:generate && npm run docs:copy:tmp && npm run docs:checkout:gh-pages && npm run docs:copy:tmp:5x",
-    "docs:prepare:publish:6x": "npm run docs:checkout:6x && npm run docs:merge:6x && npm run docs:clean:stable && env DOCS_DEPLOY=true npm run docs:generate && npm run docs:copy:6x:tmp && npm run docs:checkout:gh-pages && npm run docs:copy:tmp:6x",
+    "docs:prepare:publish:6x": "npm run docs:checkout:6x && npm run docs:merge:6x && npm run docs:clean:stable && env DOCS_DEPLOY=true npm run docs:generate && npm run docs:move:6x:tmp && npm run docs:checkout:gh-pages && npm run docs:copy:tmp:6x",
     "docs:check-links": "blc http://127.0.0.1:8089 -ro",
     "lint": "eslint .",
     "lint-js": "eslint . --ext .js",