Update docs: update theme src url
<ul>
<li><a href="https://docs.oracle.com/javase/8/javafx/api/javafx/scene/doc-files/cssref.html">JavaFX: CSS reference</a></li>
<li><a href="https://docs.oracle.com/javase/8/javafx/user-interface-tutorial/apply-css.htm">JavaFX: Working with JavaFX UI Components</a></li>
- <li><a href="https://github.com/Col-E/Recaf/tree/master/src/resources/style">Recaf default CSS</a></li>
+ <li><a href="https://github.com/Col-E/Recaf/tree/master/src/main/resources/style">Recaf default CSS</a></li>
</ul>
<h1 id="examples">Examples</h1>
<h3 id="t1">Flat theme</h1>
