Remove unused css files (#447)

Co-authored-by: Yuki Okushi <[email protected]>

Author: yochem

.prettierignore

@@ -1,7 +1,4 @@
 .github/
-css/blueprint/
-lang/
-spec/
 package-lock.json
 *.md
 _layouts/default.html

_config.yml

@@ -55,3 +55,5 @@ defaults:
       path: ''
     values:
       layout: default
+sass:
+  style: compressed

_layouts/default.html

@@ -5,9 +5,6 @@
     <link rel="stylesheet" href="/css/main.css">
     <link href="/assets/500x500(dark).jpg" rel="icon" media="(prefers-color-scheme: light)">
     <link href="/assets/500x500(light).jpg" rel="icon" media="(prefers-color-scheme: dark)">
-    {% if page.custom_css %}
-      <link rel="stylesheet" href="/css/{{ page.language }}.css">
-    {% endif %}
     <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"/>
     {% seo %}
   </head>

css/blueprint/ie.css

@@ -1,3 +1,6 @@
+---
+---
+
 /*
 CSS for semver.org
 @author Mathias Bynens