Remove outdated reference to 'MDwiki' in vi-first-steps.md

[Saby-Bishops]

Please verify the following:

• This issue is related to the Virtual Interns First Steps document or Planet User Manual.
• You have searched for relevant keywords in recent open and closed issues to avoid duplicates.

URL to the MDwiki page containing the problem

https://open-learning-exchange.github.io/#!pages/vi/vi-first-steps.md

Problem

The guide frequently refers to itself as the "MDwiki" (e.g., "The MDwiki offers plenty of resources..."). However, the project has moved to a standard GitHub Pages site. This terminology is outdated and confusing for new interns who see a Jekyll site, not an MDwiki.

Screenshots (when necessary)

Proposed solution(s)

Replace all instances of "MDwiki" with accurate terms like "this handbook," "the First Steps guide," or "this documentation." This reduces confusion and modernizes the content.

[JackTheSparow]

Using different(and commonly used) words like "handbook", "First Steps guide" and "this documentation" creates more confusion than "MDwiki". "MDwiki" keeps things fluent and same throughout the page.