Convert Hugo versioned docs to mkdocs format

[bitsondatadev]

This PR updates the versioned docs from Hugo to mkdocs format.

• Removes Hugo front matter.
• Make the filename and the url equivalent
  • branching-and-tagging.md to branching.md
• Standardize links to mkdocs format to avoid this.
• MkDocs specific formatting such as:
  • {{% icebergVersion %}} to {{ icebergVersion }}
  • {{< hint info >}} to !!! info
• Fix broken links from previous site.
• Some minor spelling and grammar fixes.

[Fokko]

I ran the docs locally, went through quite a few pages, and it looks good.

[rice668]

Hi, @bitsondatadev Just a ask, why do we need to make this change ?

[bitsondatadev]

@rice668 see: #8151 and #9520

[Fokko]

This looks good, thanks @bitsondatadev 🙌