Remove Duplicate Field Plugin Section

[johannes-lindgren]

The following commit introduced a second section for field plugins:

https://github.com/storyblok/awesome-storyblok/commit/1cf28b2ae92cb3913edc795eb5d42b288d693c43

Futhermore, it moved the Tool subsections from Tools to the new Field-Types section.

This pull request removed the duplicate section, moves the tools subsections back to their place.