Add read-only Disqus comments from an export

Now the only way to engage with my site is through email, although I'll
probably add webmention support at some point in the future.

I used Gemini 2.5 Pro to put together the bones of the plugin, HTML, and
CSS changes. This saved me a good couple of hours and having to relearn
Ruby.

Author: ruslanosipov

Gemfile

@@ -14,6 +14,8 @@ gem "minima", "~> 2.5"
 # uncomment the line below. To upgrade, run `bundle update github-pages`.
 # gem "github-pages", group: :jekyll_plugins
 
+gem "nokogiri"
+
 group :jekyll_plugins do
   gem "jekyll-feed", "~> 0.12"  # RSS feed.
   gem "jekyll-paginate", "~> 1.1.0"  # Homepage pagination.

_config.yml

@@ -38,8 +38,7 @@ paginate_path: "posts/:num/"
 feed:
   path: /atom.xml  # Compatible with Octopress path.
 
-disqus:
-  shortname: rosipov
+disqus_export_path: _data/disqus-export-2025-06-09.xml
 
 google_analytics: UA-48506044-1