docs: add Markdown dollar sign escaping rule to prevent LaTeX render

[mikepsinn]

Summary by Sourcery

Refine documentation formatting by restructuring the AI engineer application instructions, removing an outdated compliance note, and escaping dollar signs in economic analysis markdown to prevent unintended LaTeX rendering, while adding a rule to enforce dollar sign escaping.

Enhancements:

• Add a Markdown linting rule file to enforce dollar sign escaping

Documentation:

• Restructure AI engineer application instructions with explicit contact information and detailed itemized requirements
• Remove the outdated 501(c)(3) Compliance Note from the AI engineer careers page
• Escape dollar signs in the DFDA cost-benefit analysis markdown to prevent unintended LaTeX rendering

[github-actions]

Current Voting Result
Vote on this comment with 👍 or 👎.

Vote Summary:
0 👍
0 👎

Acceptance Criteria:

• 51% of weighted votes needs to be to approve
• 1 minimum # of unique voters required
• at least 720 minutes of voting