Nested inline active fields inside Bootstrap horizontal forms

Comparing #10 with #11

Content

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- **Step 2a:** Enclose all your inline fields inside a container with `form-group kv-fieldset-inline` class.
- **Step 2b:** Setup `showLabels` property to false for each active field.
- **Step 2c:** Use `Html::activeLabel` or `Html::label` to generate your field labels.

> Tip:
For ease of useInstead of setting `showLabels` at each active field level, you can also set a `showLabels` property at the `kartik\widgets\ActiveForm` configuration level within the `formConfig` array. This will help you set display of labels to `false` for all active fields within the form.

For example

```php
<?php $form = ActiveForm::begin([
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