fix: migrate bin & pipx to new username

[yozachar]

Summary

Description:

• Tool repo URL: bin, pipx
• Plugin repo URL: asdf-bin, asdf-pipx

Checklist

• Format with scripts/format.bash
• Test locally with scripts/test_plugin.bash --file plugins/<your_new_plugin_name>
• Your plugin CI tests are green
  • Tip: use the plugin_test action from asdf-actions in your plugin CI

[jthegedus]

@yozachar Please explain why these should be changed?

[yozachar]

@jthegedus I changed by GitHub username from @joe733 to @yozachar.

• In case redirections from former username fails or someone else acquires the same, asdf plugin installation will fail.
• The status badges probably won't work for long with the older username.

Oh and these, in .tool-versions file:

nodejs     18.18.0
shellcheck 0.9.0
shfmt      3.7.0

1. Because the current node-js LTS version is 20.9.0. Shall I bump version?
2. Latest version of shfmt is 3.7.0 and
3. Formatting looks better.

[jthegedus]

thanks for clarifying