TOC: Do not manually compute TOC depth

[rebz]

It does not matter what I define the last level to be, the package appears to overwrite what I define if it is not 1 greater than toc-first-level.

Example:

<vue-markdown
    :toc="true"
    :toc-first-level="2"
    :toc-last-level="2"
/>

I want to ONLY SHOW Headline 2 in my Table of Contents. Unfortunately, it will always show Headline 2 and Headline 3. It is not possible for me to get around this with the current iteration of this package.

The package should not override the depth that I have dictated for the Table of Contents.