refactor: Use $HOME in shell rc for better dotfile management

[lquenti]

Issue for this PR

Closes #39329

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

It uses literally $HOME instead of the expanded home in the shell rc file for easier dot file management (for example, my vms have cloud as username while my laptop has lquenti.

How did you verify your code works?

• Startup basic ubuntu container (with git and curl)
• git clone the repo
• bash install
• verify the bashrc manually

Screenshots / recordings

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

If you do not follow this template your PR will be automatically rejected.

[github-actions]

Hey! Your PR title Use $HOME in shell rc for better dotfile management doesn't follow conventional commit format.

Please update it to start with one of:

• feat: or feat(scope): new feature
• fix: or fix(scope): bug fix
• docs: or docs(scope): documentation changes
• chore: or chore(scope): maintenance tasks
• refactor: or refactor(scope): code refactoring
• test: or test(scope): adding or updating tests

Where scope is the package name (e.g., app, desktop, opencode).

See CONTRIBUTING.md for details.