Remove the prepending of ... to snippets

[sanex3339]

Remove the prepending of ... to snippets

I have no idea why these ... are added, but it makes this plugin unusable, because nobody wants to see ... in their code blocks

For example we have the following use case:

```tsx
{% include_file "{{ page.dirname }}/snippets/some_file.tsx" snippet="imports" %}

{% include_file "{{ page.dirname }}/snippets/some_file.tsx" snippet="code" %}

We don't need the ... in front of each snippet

Fixes #12