Insert layer for 'Implementation' section

Author: yawnoc

index.cmd

@@ -34,7 +34,9 @@ See b<https://github.com/stroke-input> for the GitHub organisation.
 --
 
 
-## Stroke Input Method (筆畫輸入法) for Android
+## Implementations
+
+### Stroke Input Method (筆畫輸入法) for Android
 
 ==
 - [![Get it on F-Droid]{width=180 height=auto}(https://fdroid.gitlab.io/artwork/badge/get-it-on.png)][f-droid]
@@ -46,7 +48,7 @@ See b<https://github.com/stroke-input> for the GitHub organisation.
 [google-play]: https://play.google.com/store/apps/details?id=io.github.yawnoc.strokeinput
 
 
-## Stroke input method (筆畫輸入法): JavaScript
+### Stroke input method (筆畫輸入法): JavaScript
 
 ==
 - [Try it online](/javascript/)

index.html

@@ -25,7 +25,8 @@ <h1>Stroke input method (<span lang="zh-Hant">筆畫輸入法</span>)</h1>
 <p>
 See &lt;<a href="https://github.com/stroke-input">https://github.com/stroke-input</a>&gt; for the GitHub organisation.
 </p>
-<h2>Stroke Input Method (<span lang="zh-Hant">筆畫輸入法</span>) for Android</h2>
+<h2>Implementations</h2>
+<h3>Stroke Input Method (<span lang="zh-Hant">筆畫輸入法</span>) for Android</h3>
 <ul>
 <li>
 <a href="https://f-droid.org/en/packages/io.github.yawnoc.strokeinput/"><img alt="Get it on F-Droid" src="https://fdroid.gitlab.io/artwork/badge/get-it-on.png" width="180" height="auto"></a>
@@ -37,7 +38,7 @@ <h2>Stroke Input Method (<span lang="zh-Hant">筆畫輸入法</span>) for Androi
 <a href="https://github.com/stroke-input/stroke-input-android">Source code on GitHub</a>
 </li>
 </ul>
-<h2>Stroke input method (<span lang="zh-Hant">筆畫輸入法</span>): JavaScript</h2>
+<h3>Stroke input method (<span lang="zh-Hant">筆畫輸入法</span>): JavaScript</h3>
 <ul>
 <li>
 <a href="/javascript/">Try it online</a>