[Concept Entry] Created Terms folder and added Euclidean algorithm

[dakshdeepHERE]

Description

Type of Change

• Adding a new entry
• Updating the documentation

Checklist

• All writings are my own.
• My entry follows the Codecademy Docs style guide.
• My changes generate no new warnings.
• I have performed a self-review of my own writing and code.
• I have checked my entry and corrected any misspellings.
• I have made corresponding changes to the documentation if needed.
• I have confirmed my changes are not being pushed from my forked main branch.
• I have confirmed that I'm pushing from a new branch named after the changes I'm making.
• Under "Development" on the right, I have linked any issues that are relevant to this PR (write "Closes # in the "Description" above).

Fixes #2454

[dakshdeepHERE]

@caupolicandiaz All the changes are done. Can you check once if there's any other changes needs to be done?

[caupolicandiaz]

@dakshdeepHERE @SSwiniarski I pushed a couple of additional small edits. I think this is good to go.

[github-actions]

👋 @dakshdeepHERE
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[SSwiniarski]

@dakshdeepHERE Congrats on the new entry. Live link here: https://www.codecademy.com/resources/docs/general/algorithm/euclidean-algorithm