Add post-download donate invitation

src/Download.md

@@ -3,6 +3,8 @@ layout: default
 ---
 # Download
 
+<script src="{{site.baseurl}}/js/post-download-donate-message.js"></script>
+
 For installation instructions see
 [Installation]({{site.baseurl}}/Get-Help/User-Guide/Installation/).
 

src/_includes/download-link

@@ -1,4 +1,4 @@
-<a href="{{include.file.url}}">
+<a href="{{include.file.url}}" class="download">
 For
 {% case include.file.platform %}
 {% when 'windows' %}    Windows

src/_wiki/Support.md

@@ -0,0 +1,11 @@
+# Support our work
+
+<p id="downloading"></p>
+<script>
+if (new URLSearchParams(window.location.search).get("post-download") == "true") {
+    document.getElementById("downloading").textContent = "Your download should be starting...";
+}
+</script>
+
+If you find DAISY Pipeline useful, please help us by donating to support its
+ongoing maintenance. [Support out work](https://daisy.org/pipelineAppSponsor).

src/_wiki/_Sidebar.md

@@ -52,7 +52,7 @@
     * [[Troubleshooting Desktop Application|https://github.com/daisy/pipeline-ui/wiki/Troubleshooting]]
   * [[Forum|https://github.com/daisy/pipeline/discussions]]
   * [[Contact|mailto:[email protected]]]
-* [[Contribute​|Contribute]]
+* [[Contribute|Contribute]]
   * [[Source Code|https://github.com/daisy/pipeline]]
   * [[Developer Guide|Developer-Guide]]
     * [[Source Code|Sources]]
@@ -64,4 +64,5 @@
     * [[Debugging|Debugging]]
     * [[Release Management|Releasing]]
   * [[Easy Hacks|http://daisy.github.io/pipeline/Contribute/Easy-Hacks.html]]
+* [[Support​|Support]]
 * [[DAISY Home|http://www.daisy.org]]

src/js/post-download-donate-message.js

@@ -0,0 +1,12 @@
+---
+---
+window.addEventListener("load", function() {
+	let links = document.getElementsByClassName("download");
+	for (let i = 0; i < links.length; i++) {
+		links[i].addEventListener("click", function(event) {
+			setTimeout(function() {
+				window.location.href = "{{site.baseurl}}/Support.html?post-download=true";
+			}, 1000);
+		});
+	}
+}