Bump nokogiri from 1.13.3 to 1.13.4 in /docs

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.13.3 to 1.13.4.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/v1.13.4/CHANGELOG.md)
- [Commits](https://github.com/sparklemotion/nokogiri/compare/v1.13.3...v1.13.4)

---
updated-dependencies:
- dependency-name: nokogiri
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

docs/Gemfile.lock

@@ -121,6 +121,7 @@ GEM
       pathutil (~> 0.9)
       rouge (>= 1.7, < 4)
       safe_yaml (~> 1.0)
+    jekyll-analytics (0.1.14)
     jekyll-avatar (0.7.0)
       jekyll (>= 3.0, < 5.0)
     jekyll-coffeescript (1.1.1)
@@ -232,7 +233,7 @@ GEM
       jekyll-seo-tag (~> 2.1)
     minitest (5.15.0)
     multipart-post (2.1.1)
-    nokogiri (1.13.3)
+    nokogiri (1.13.4)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     octokit (4.22.0)
@@ -267,14 +268,10 @@ GEM
       ethon (>= 0.9.0)
     tzinfo (1.2.9)
       thread_safe (~> 0.1)
-    tzinfo-data (1.2021.1)
-      tzinfo (>= 1.0.0)
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.8)
     unicode-display_width (1.8.0)
-    wdm (0.1.1)
-    webrick (1.7.0)
     zeitwerk (2.5.4)
 
 PLATFORMS
@@ -284,11 +281,8 @@ DEPENDENCIES
   github-pages (~> 225)
   jekyll-analytics
   jekyll-feed (~> 0.6)
-  kramdown-parser-gfm
+  jekyll-remote-theme
-  tzinfo (~> 1.2)
   tzinfo-data
-  wdm (~> 0.1.0)
-  webrick (~> 1.7)
 
 BUNDLED WITH
    2.1.4