created new entry for pop_front() under deque.

[RishitModi]

Description
This PR adds a new documentation entry for the pop_front() method of the C++ std::deque container.

A new file, pop-front.md, has been created at the path content/cpp/concepts/deque/terms/pop-front/pop-front.md. The entry includes a definition of the method, its syntax, and provides both a standard example and a runnable Codebyte example to illustrate its usage.

Issue Solved
Closes #7653

Type of Change
Adding a new entry

Checklist
[x] All writings are my own.
[x] My entry follows the Codecademy Docs style guide.
[x] My changes generate no new warnings.
[x] I have performed a self-review of my own writing and code.
[x] I have checked my entry and corrected any misspellings.
[x] I have made corresponding changes to the documentation if needed.
[x] I have confirmed my changes are not being pushed from my forked main branch.
[x] I have confirmed that I'm pushing from a new branch named after the changes I'm making.
[x] I have linked any issues that are relevant to this PR in the Issues Solved section.

[mamtawardhani]

Looks good for a second review! 🚀

[RishitModi]

thanks! @codecademy-docs @mamtawardhani can we undergo the second review?

[mamtawardhani]

It will be done soon 🚀 @RishitModi

[RishitModi]

alright thanks waitingg! @mamtawardhani @codecademy-docs

[RishitModi]

@mamtawardhani @codecademy-docs - Did it undergo the second review? Is there anything I should work on to improve it?

[Radhika-okhade]

Made minor changes.

[Radhika-okhade]

@RishitModi The entry looks good to be merged.

[github-actions]

👋 @RishitModi
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