[Pages]Update Hexo framework guides, remove unnecessary steps

[ousugo]

Summary

According to the Hexo official documentation, when hexo init is executed, the dependency installation is complete and there is no need to perform npm install to install the dependency.

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.