Adding Bash commands to content/command-line/conepts/bash.md

[RalphEllis]

Description

I felt the 'Bash' article (docs/content/command-line/concepts/bash.md) in the 'command-line' article was a bit limited, so I've added some basic navigation and file/directory commands as a starting point.

Issue Solved

#4963

Type of Change

• Editing an existing entry (adding / extending content)

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.
• [ ✓] I have linked any issues that are relevant to this PR in the Issues Solved section.

[CLAassistant]

All committers have signed the CLA.

[RalphEllis]

This is my first pull request, being done as part of my Codeacademy gitHub course. Any suggestions or feedback would be appreciated.

[RalphEllis]

Signed the CLA; my apologies, thought I had done that already.

[github-actions[bot]]

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