docs(demo): link to old documentation (closes #5211)

apps/edit-docs/demo/root/Trilium Demo/Formatting examples/Code blocks.html

@@ -21,8 +21,12 @@
           language, should that fail it is possible to manually adjust it. The color
           scheme for the syntax highlighting is adjustable in settings.&nbsp;</p><pre><code class="language-application-javascript-env-frontend">function helloWorld() {
 
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+
 	alert("Hello world");
 
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 }</code></pre>
         <p>For larger pieces of code it is better to use a code note, which uses
           a fully-fledged code editor (CodeMirror). For an example of a code note,