feat: include elastic & nix keywords

[rhenning]

This pull request updates skills in src/professional.md to reflect broader platform experience, new technologies, and updated terminology. The main focus is on expanding the list of relevant keywords, updating supported operating systems, and clarifying your experience with AI tools.

Keyword and technology updates:

• Added new keywords to reflect experience with macos, nix, nixos, site reliability, streaming, elastic, and elasticsearch to the keywords section.

Platform and tooling updates:

• Updated the list of operating systems to include NixOS and clarified Linux distributions, as well as mentioning macOS administration more explicitly.
• Updated programming language and scripting experience by removing the trailing period and clarifying Unix shell scripting experience.

AI tools and workflow:

• Clarified AI experience to include "pair programming with AI agents" instead of just prompt engineering.

[Copilot]

Pull request overview

This pull request adds elastic and nix-related keywords to a professional resume/profile document, along with some minor formatting improvements and content updates.

Changes:

• Added new keywords: macos, nix, nixos, site reliability, streaming, elastic, and elasticsearch
• Updated Linux distributions list to include NixOS and reformatted for clarity
• Removed trailing period from shell scripting line for consistency
• Updated AI tools description to reference "pair programming with AI agents" instead of "prompt engineering"

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