docs: Make related commands use split replace append

[sudojunior]

This change has been forced, despite the .gitignore created by rake. Code examples and References headers have been removed due to no content needed there.

Reason for the change

• Before this change, the page.path was attempting to replace page.url with the *.md extension that doesn't exist.
• Would have used page.command but it didn't have cross platform consistency.
• Would have flipped the target (swapping positions of page.url and page.path), but the related target string isn't complete enough to be auto resolved.

Related commands on documentation are inserted into an existing url, would have rewritten the frontmatter - but that would require changes on a majority of the api pages.

Description

The reason for the complex replacement join is due to how liquid identifies and handle strings (and also the order of execution)

• Actual: split, slice, join(/), append(/), append(related[1])
• Attempted: split, slice, append(related[1]), join(/) Placing append before a join breaks the sequence and turns the array of strings into a concatenated string before the join can run resulting in apijavascriptnext instead of api/javascript/next/

Checklist

• [x] I have read and agreed to the RethinkDB Contributor License Agreement

Side notes

• The .gitignore does not exclude the virtual environment created by rake.

  Path: /.venv

• Gemlock bundler version is at least one minor version behind (2.1.4 -> 2.2.9)

  Using ruby 2.7.2p137 on GitHub codespace.

[sudojunior]

Upon closer inspection it appears to only effect localized development. The production deployment of this repository is unaffected by this.

Cause unknown, internal cache is not being emptied.