[FEATURE] Add Isso Commenting server support.

[GraciousGpal]

Describe the feature you want 描述你的功能需求

Isso is Commenting system similar to Disqus but it is self hosted and private.

Comments written in Markdown

Users can edit or delete own comments (within 15 minutes by default).

Comments in moderation queue are not publicly visible before activation.

SQLite backend

Because comments are not Big Data.

Disqus & WordPress Import

You can migrate your Disqus/WordPress comments without any hassle.

Configurable JS client

Embed a single JS file, 65kB (20kB gzipped) and you are done.

Supports Firefox, Safari, Chrome and IE10.

Useful reference 有价值的参考

https://isso-comments.de/