replace outdated 'MDwiki' references (fixes #3671)

[Saby-Bishops]

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Description, Screenshots and/or Screencast

fixes #3671

Changes:

• Replaced outdated references to "MDwiki" with more accurate terms like "this handbook" and "this guide" in vi-first-steps.md.
• This modernizes the documentation and reduces confusion for new interns, as the project now uses GitHub Pages with Jekyll instead of the MDwiki framework.

Raw.Githack Preview Link

https://raw.githack.com/Saby-Bishops/Saby-Bishops-Planet.github.io/3671-remove-mdwiki-refs/#!pages/vi/vi-first-steps.md

[jessewashburn]

Nice clean PR, but I think calling it an MDWiki is appropriate, since it clues interns into the fact they'll be working with markdown files. I'll defer to @Mutugiii in this case.

[Saby-Bishops]

Nice clean PR, but I think calling it an MDWiki is appropriate, since it clues interns into the fact they'll be working with markdown files. I'll defer to @Mutugiii in this case.

Hey @Mutugiii @dogi @jessewashburn, could you please provide some guidance on this PR?

The change is simple, but the reasoning behind it (updating outdated terminology) is a broader question. Should we merge this to modernize the docs, or should we keep the historical "MDwiki" name for context?

If this isn't the right approach, please let me know if I should:

Close this PR and create a new issue altogether and work on that, or
Leave this PR open for it to be merged as-is.

[Mutugiii]

We should keep the MDwiki name, since it helps interns to understand the underlying tech used in this repo: https://dynalon.github.io/mdwiki/#!index.md

I recommend closing this PR & related issue and instead work on a new one

[dogi]

totally disagree with hiding
I am not sure if on all 3 places
but at least at one I would even double down and point by link to the original sources:
https://dynalon.github.io/mdwiki/#!index.md