chore: use stylelint-stylus (#441)

Author: ota-meshi

.vscode/settings.json

@@ -18,7 +18,6 @@
         "source.fixAll.eslint": true,
         "source.fixAll.stylelint": true
     },
-    "stylelint.customSyntax": "stylelint-plugin-stylus/custom-syntax",
     "stylelint.validate": [
         "css",
         "html",

docs/.vuepress/styles/index.styl

@@ -1,8 +1,8 @@
-@media screen and (min-width: 400px) and (max-width: 450px)
+@media screen and (min-width 400px) and (max-width 450px)
   #app .navbar .site-name
     font-size calc(1.3rem * 0.8)
 
-@media screen and (max-width: 400px)
+@media screen and (max-width 400px)
   #app .navbar
     .home-link
       display flex

docs/.vuepress/styles/stylelint.config.js

@@ -1,6 +1,8 @@
 module.exports = {
-    extends: ["stylelint-config-standard", "stylelint-plugin-stylus/standard"],
+    extends: ["stylelint-config-standard", "stylelint-stylus/standard"],
     rules: {
         "no-descending-specificity": null,
+        "selector-class-pattern": null,
+        "value-keyword-case": null,
     },
 }