feat(style): gapless border for blockquotes, fixes https://github.com/amsf/amsf-curtana/issues/4
feat(style): gapless border for blockquotes, fixes https://github.com/amsf/amsf-curtana/issues/4

BREAKING CHANGE: Now paragraphs in a blockquote will get a single gapless border on the left side, you don't need special markup to achieve this now:

```markdown
> … these mean that in many fields the rule will be: Build it, and they will come.
>
> Paul Graham
```

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