Revert "Bump minimal-mistakes to 4.26.2 (#136)" (#140)

This reverts commit 7eea33c984.

Gemfile

@@ -35,5 +35,3 @@ end
 gem "wdm", "~> 0.1.1", :platforms => [:mingw, :x64_mingw, :mswin]
 
 gem "webrick", "~> 1.7"
-
-gem "csv", "~> 3.0"

_config.yml

@@ -18,7 +18,7 @@
 # You can create any custom variable you would like, and they will be accessible
 # in the templates via {{ site.myvariable }}.
 
-remote_theme             : "mmistakes/minimal-mistakes@4.26.2"
+remote_theme             : "mmistakes/minimal-mistakes@4.24.0"
 minimal_mistakes_skin    : "default" # "air", "aqua", "contrast", "dark", "dirt", "neon", "mint", "plum", "sunrise"
 locale: "zh-CN"