'Changing Color Scheme' Documentation is incorrect

Both [official](https://akveo.github.io/blur-admin/articles/011-changing-color-scheme/) and [src](https://github.com/akveo/blur-admin/blob/master/docs/contents/articles/011-changing-color-scheme/index.md) documentation.

Instructions state:

> Now you can start changing your colors. For example, after playing a bit with different colors, we changed 5 first main variables in _dark.scss file:

```
$default: rgba(#000000, 0.2); //Panel background color
$body-bg: #F0F3F4; // Body background color
$default-text: #ffffff; // Default text color
$help-text: #eeeeee; // Default subtext color
$label-text: #ffffff; // Text for labels in forms (Basically it should be equal to default-text in most cases)
```

Upon following the rest of the directions, the real-world result does not match the example [image](https://akveo.github.io/blur-admin/articles/011-changing-color-scheme/new-color-scheme.jpg).

This is because of $body-bg and $default-text values. The full, corrected snippet should be:

```
$default: rgba(#000000, 0.2); //Panel background color
$body-bg: #4e4e55; // Body background color
$default-text: #e2e2e2; // Default text color
$help-text: #eeeeee; // Default subtext color
$label-text: #ffffff; // Text for labels in forms (Basically it should be equal to default-text in most cases)
```