docs(Components/ListPosts): use Timber's get_preview function in howto.md (#209)
docs(Components/ListPosts): use Timber's get_preview function in howto.md (#209)

* refactor(Components/ListPosts/howto.md): Modified the Manual Post Teaser selection example

Using Timber get_preview function instead of using custom class functions

* refactor(Components/ListPosts/howto.md): Small howto refator

Changed hardcoded 'More' to $data['readMoreLabel']

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