Fix layout

Fixes #1 

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Correct paths: url and baseurl

`_config.yml`:

```yaml
url: https://pages.gitlab.io/
root: "/hexo/"
```

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# **Results**

![hexo-pages](/uploads/e7b2379f430a09b4ea184a0c55822fe0/hexo-pages.png)

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Forked build: [passed](https://gitlab.com/virtuacreative/hexo/commit/01f3d994e6f5c23ee645beb7914ce128d87b711b)

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cc/ @axil 


See merge request !1

Fixes https://gitlab.com/pages/hexo/issues/1