Stylelint is a css linter: https://stylelint.io/
As part of this change we have added two javascript scripts:
```
pnpm lint:css
pnpm lint:css:fix
```
Look at `.vscode/settings.json.sample` and `.vscode/extensions.json` for
configuration in VSCode.
---------
Co-authored-by: Joffrey JAFFEUX <j.jaffeux@gmail.com>
- Moves `<ChatMessageInfo />` to `<Chat::Message::Info />`
- Moves `<ChatMessageAvatar />` to `<Chat::Message::Avatar />`
- Moves `<ChatMessageLeftGutter />` to `<Chat::Message::LeftGutter />`, adds tests
- Creates `<Chat::Message::Error />`
- Creates `<Chat::Message::MentionWarning />`, adds tests and a styleguide
- Creates a model for ChatMessageMentionWarning, adds fabricator for it
- Keeps the enter/leave viewport logic inside the `<ChatMessage />` component instead of bubbling it to the channel and thread components
- Adds a scale animation when clicking a reaction
- Creates `chat/later-fn` modifier which accepts a function and a delay. It allows to call a function Xms after a component has been inserted, it's useful for animations.
- Moves css code out of chat-message into relevant files
- Deletes unused code
<!-- NOTE: All pull requests should have tests (rspec in Ruby, qunit in JavaScript). If your code does not include test coverage, please include an explanation of why it was omitted. -->
