Exportable bash profile

[UnstoppableMango]

• Start an exportable bash profile
• Finish up the main task

[Copilot]

Pull request overview

This PR introduces a reusable, Nix-generated “portable” bash rc script and reuses its alias set in the zsh Home Manager module, making it possible to build and run a consistent bash environment on machines without the full Home Manager setup.

Changes:

• Added shells/bash/default.nix exporting shared shellAliases and mkPortableBashRc.
• Updated zsh module to source shellAliases from the shared portable shell definition.
• Exposed a flake package erasmussen-portable-bashrc and documented how to build/run it.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
shells/zsh/default.nix	Replaces inline zsh aliases with shared aliases imported from the new bash module.
shells/bash/default.nix	New portable bash rc generator and shared alias definitions.
flake.nix	Adds a per-system package that builds the portable bash rc text artifact.
README.md	Documents building and launching bash with the generated rc file.

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