Allow html-indent to start with 0 indent

[rightaway]

html-indent requires something like

<template>
  <div>
    <div>
      ...
    </div>
  </div>
</template>

I'd like an option where it's possible to have it like this, where the first element under the template has no indent (lined up with template tag), and everything under that is indented normally. When you have large templates that are nested deeply, saving that first level of indentation saves space. It also allows being consistent with the rules for the <script> tags which allow things underneath it to start with an indentation level of 0.

<template>
<div>
  <div>
    ...
  </div>
</div>
</template>

[mysticatea]

Thank you for the issue.

I think this is a duplicate of #292. Please track that.