feat: add vim fold

docs/2023-05-03-neovim.html

@@ -135,6 +135,15 @@
         </ul>
       </li>
     </ul>
+    <h2>
+      <a id="user-content-fold" class="anchor" aria-hidden="true" href="#fold"
+        ><span aria-hidden="true" class="octicon octicon-link"></span></a
+      >Fold
+    </h2>
+    <ul>
+      <li><code>zR</code>: open all folds.</li>
+      <li><code>za</code>, <code>zA</code>: toggle fold</li>
+    </ul>
     <h2>
       <a
         id="user-content-keymap"

posts/2023-05-03-neovim.md

@@ -77,6 +77,11 @@ Advance:
   - Support jump to Go definition with
     [fatih/vim-go](https://github.com/fatih/vim-go).
 
+## Fold
+
+- `zR`: open all folds.
+- `za`, `zA`: toggle fold
+
 ## Keymap
 
 Use both `\` and `;` as leader key: