feat: career positions

[iamacook]

What it solves

Partially resolves #3

How this PR fixes it

The careers page open positions has been implemented according to the design.

Screenshots

[github-actions]

ESLint Summary View Full Report

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Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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^{Report generated by eslint-plus-action}