All lessons: Remove/replace Replit suggestions

[Eduardo06sp]

Because

we are removing Replit from the curriculum, so we need to remove any mentions of it.

This PR

• Removes any mention of Replit
  • Leaves IRB recommendation in place wherever it is already mentioned
• Replaces specific Replit suggestions with a more generic suggestion to just use a REPL
• Removes instructions for submitting a Replit live demo included in the Basic Informational Site project (from Introduction to NodeJS course)
• Replaces Replit suggestion with Codepen suggestion instead (in Join the Odin Community lesson)
  • Codepen is frequently used/recommended in the course and Discord already, so it makes more sense to suggest Codepen anyways

Issue

Related to #29054

Additional Information

Pull Request Requirements

• I have thoroughly read and understand The Odin Project curriculum contributing guide
• The title of this PR follows the location of change: brief description of change format, e.g. Intro to HTML and CSS lesson: Fix link text
• The Because section summarizes the reason for this PR
• The This PR section has a bullet point list describing the changes in this PR
• If this PR addresses an open issue, it is linked in the Issue section
• If any lesson files are included in this PR, they have been previewed with the Markdown preview tool to ensure it is formatted correctly
• If any lesson files are included in this PR, they follow the Layout Style Guide

[Eduardo06sp]

The linter errors don't seem to be related to the specific changes I made.

I absolutely don't mind fixing them if needed. However, I don't want to do that without permission.