fix(docs-infra): remove redundant `search-results` styles (#31390)

Previously, `.search-area` had a default style of `display: flex`, but
it was overriden to `display: block` in media queries for
`max-width: 480px` and `min-width: 600px`. As a result, it only had
`display: flex` between 481px and 599px.

Since no flex layout features are necessary inside `.search-area`, this
commit changes the style to always be `display: block` (i.e. the default
for `div` elements).

PR Close #31390

aio/src/styles/2-modules/_search-results.scss

@@ -19,8 +19,6 @@ aio-search-results {
     box-sizing: border-box;
 
     .search-area {
-      display: flex;
-      flex-direction: column;
       margin: 16px;
       height: 100%;
 
@@ -66,18 +64,10 @@ aio-search-results {
           }
         }
       }
-
-      @include bp(tiny) {
-        display: block;
-      }
     }
 
     @media (max-width: 480px) {
       display: block;
-
-      .search-area {
-        display: block;
-      }
     }
   }