Migrate to Docusaurus

I have migrated from Gatsby to Docusaurus for the blog from my old blog https://mhmd.io.

And also from mkdocs to Docusaurus for the wiki and documentation from https://docs.mhmd.io

Now I can manage the website, blog, and documentation using Docusaurus only which based on React.

I will decommission `mhmd.io` domain and use only `cloudfalcon.dev` for both personal and professional work.