Support additional element in Utterances

[hurutoriya]

Hi I love minimo theme 👍

I added Support additional elements for Utterances

• theme: help to match your blog design ❤️
• label: help to structured Github issues and searchable 🔍

If you have a time. Please cloud you check it? 👍

[MunifTanjim]

@hurutoriya thanks so much for the PR! ❤️

Sorry that it took this long to merge this!

[hurutoriya]

@MunifTanjim 😄 Thank you review!!