Make staticman_v3 default Staticman comment provider

[cloudwheels]

Summary

This is a skeleton issue based on #2034

The backend service for staticman v2 has become overwhelmed. Users are able to set up their own backend, but the developers have created a github application which resolves the issue and avoids the need to create this custom backend.

In effect, whilst the v2 api will continue to run, v3 offers a much smoother and more stable implementation and should be the default going forward.

This should involve small changes to _config.yml, the bundled staticman.yml, _includes/comments.html and related documentation + testing.

My current use case for minimal-mistakes is helping me to pass my exams in horticulture: they're a few weeks time. eek. It's a nice little PR I'd be happy to take on, but I'm very good at letting coding be a distraction to learning the actual plant stuff, so if this is accepted and anyone else is keen before mid-February, please do carry on 👍

[cloudwheels]

#1956 is related. see: #2034 (comment)

[cloudwheels]

@mmistakes I just read your very detailed article on Staticman from a couple of years ago: https://mademistakes.com/articles/improving-jekyll-static-comments/
Can you confirm whether nested comments is available in the minimal-mistakes theme (doesn't look like it)?
If not is it possible to point me to where it's done in one of your other themes, as per the article?
Thanks.

[mmistakes]

Nested comments are not supported in any of my themes.
Have a look on my personal site and repo to see how I’ve done it.

If you’re starting fresh it’s much easier since you can use an internal Staticman field to assign a unique identifier for each comment as a way of referencing their parent. When I implemented it on my personal site I imported hundreds of comments from Disqus which left me with legacy comments without these UIDs.

If you search around there are others who have improved on my implementation. I don’t have the links handy but they exist.

[cloudwheels]

Thanks again for the quick response!

…

On Sun, Jan 20, 2019 at 5:49 PM Michael Rose ***@***.***> wrote: Nested comments are not supported in any of my themes. Have a look on my personal site and repo to see how I’ve done it. If you’re starting fresh it’s much easier since you can use an internal Staticman field to assign a unique identifier for each comment as a way of referencing their parent. When I implemented it on my personal site I imported hundreds from Disqus which didn’t left me with comments without UIDs. If you search around there are others who have improved on my implementation. I don’t have the links handy but they exist. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#2036 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AqZFOIA7gzJ1fd_-QDxHdiWxfsuMdVMTks5vFKwagaJpZM4aJX2j> .

[deadlydog]

I think this issue was closed without addressing the original ask, which was to introduce a staticman_v3 config option and make it the default. I get that you don't offer nested comments in this theme (which would be awesome and amazing if you did), but that's a separate issue than simply introducing staticman v3 support. Could we maybe get this issue reopened to introduce staticman v3 support?

[mmistakes]

@deadlydog Staticman 3 is supported. See the docs on how to configure it.

https://mmistakes.github.io/minimal-mistakes/docs/configuration/#staticman-v3

[deadlydog]

Ahhh perfect. I hadn't found that link; that looks like exactly what I need. Thanks for the super fast responses @mmistakes . You can really tell you are passionate about your projects, and I appreciate it :)