Add suport giscus comment system

[eyllanesc]

This PR implements the giscus comment system (#276)

I have not been able to test it since if it is executed locally the commenting system is deactivated.

[vercel]

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[HEIGE-PCloud]

Hello, thanks for your contribution!

To activate the comment system in local environment, run npm run start-production under DoIt folder, then you will be able to test it locally.

You probably want to run npm run build as well since the theme.min.js need to be recompiled after modifying theme.js.

Thanks!

[eyllanesc]

@HEIGE-PCloud I have already been able to test and it works.

Sorry for the ignorance but should I have loaded the "theme.min.js" and "theme.min.js.map"?

On the other hand, it is necessary to place the documentation in Chinese.

[HEIGE-PCloud]

Yes, you should commit theme.min.js and theme.min.js.map.

I will update the related Chinese documentation.

Thanks!

[vercel]

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