* Update README.md

* Update README_en-US.md

* external alternative search

* external alternative search

* external alternative search

* external alternative search

* docs: update readme.md

* feat: add assist_search

* docs: add doc for assist_search & update some others

* docs: add doc for hexo-submit-urls-to-search-engine
Co-authored-by: liuyib <1656081615@qq.com>

remove <meta name="keywords">

In the Google search engine, this keywords meta will reduce the
seo weight of the website. See:
https://webmasters.googleblog.com/2009/09/google-does-not-use-keywords-meta-tag.html

Bumps [websocket-extensions](https://github.com/faye/websocket-extensions-node) from 0.1.3 to 0.1.4.
- [Release notes](https://github.com/faye/websocket-extensions-node/releases)
- [Changelog](https://github.com/faye/websocket-extensions-node/blob/master/CHANGELOG.md)
- [Commits](https://github.com/faye/websocket-extensions-node/compare/0.1.3...0.1.4)
Signed-off-by: Ndependabot[bot] <support@github.com>
Co-authored-by: Ndependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Remove the extra configuration item