refactor: update addon to follow current best practise (#9)

* docs: "modernize" docs

* refactor: "modernize" tests

* refactor: commands should use '#!/usr/bin/env bash' instead of '#!/bin/bash'

* refactor: tests should have 'paths-ignore' for markdown

* feat: add missing ".gitattributes"

* fix: pull request template

* refactor(test): confirm Vitest in health_check

refactor: vitest UI server interaction (#5)

* fix missing "

* refactor `vitest-ui -s`

* add Vitest UI tests

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Co-authored-by: tyler36 <7234392+tyler36@users.noreply.github.com>

Merge pull request #4 from tyler36/tests

Re-work commands

initial commit