refactor (#86): remove icons from containers except for danger

Author: bencodezen

src/.vuepress/styles/index.styl

@@ -40,42 +40,30 @@
     font-weight: 600;
     margin-bottom: -0.4rem;
   }
+
   &.info {
     border-color: #007bff;
-
-    &::before {
-      content: 'i';
-      background-color: #007bff;
-    }
   }
+
   &.tip {
     border-color: #42b983;
-
-    &::before {
-      content: '✓';
-      background-color: #42b983;
-    }
   }
+
   &.warning {
     border-color: #dcbc1e;
-  background-color: #f8f8f8;
-
-
-    &::before {
-      content: '⚠';
-      background-color: #dcbc1e;
-    }
+    background-color: #f8f8f8;
   }
+
   &.danger {
     border-color: #f66;
     background-color: #f8f8f8;
 
-
     &::before {
       content: '!';
       background-color: #f66;
     }
   }
+
   &.details {
     display: block;
     position: relative;