refactor(docs): revert playground capture changes to master behavior

Restore Ace output pane, drop Prism and output-preview styling. Simplify docs:dev to rely on docs prestart.

Co-authored-by: Cursor <[email protected]>

docs/themes/navy/source/css/_partial/playground.styl

@@ -68,27 +68,6 @@
       overflow: hidden
       @media mq-mobile
         min-height: 240px
-    .output-preview
-      flex: 1 1 auto
-      min-height: 0
-      code-block-chrome()
-      overflow: auto
-      cursor: default
-      pre.highlight
-        margin: 0
-        min-height: 100%
-        padding: 16px
-        border: none
-        box-shadow: none
-        border-radius: 0
-        background: var(--highlight-background)
-        code
-          display: block
-          font-size: 14px
-          line-height: 1.5
-          background: transparent
-          padding: 0
-          white-space: pre
     .ace_editor
       font-family: font-mono
       font-size: 14px