chore: abstract personal and machine-specific details from repo

[Copilot]

Hardcoded name, email, username, and absolute machine paths were scattered across config examples, templates, and docs — making the repo less usable as a general dotfiles starter and leaking personal identifiers publicly.

Changes

chezmoi.toml.example — generic placeholders

• "Jake Prickett" → "Your Name" / "Your Work Name"
• "jprickett821@gmail.com" → "your.email@example.com"
• user = "jakeprickett" (Mac Studio device) → user = "your-username"

private_dot_codex/private_config.toml.tmpl — templated home dir

All hardcoded /Users/jakeprickett/ prefixes in project trust entries replaced with {{ .chezmoi.homeDir }}:

# Before
[projects."/Users/jakeprickett/Documents/workspace.nosync/recipe-app"]

# After
[projects."{{ .chezmoi.homeDir }}/Documents/workspace.nosync/recipe-app"]

Documentation — relative links

14 broken absolute links (/Users/jakeprickett/.local/share/chezmoi/...) across 5 doc files replaced with relative paths from docs/ to the repo root, so they resolve correctly on GitHub and locally for any user.

Minor cosmetic

• # Jake's ZSH Configuration → # ZSH Configuration in dot_zshrc.tmpl
• # Jake's Dotfiles → # Dotfiles in README.md

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