Allow server owner to inject HTML into the spots page for a "support/donate" type link. #100

templates/about.html

@@ -56,6 +56,9 @@
     <p>Spothole collects no data about you, and there is no way to enter personally identifying information into the site apart from by spotting and alerting through Spothole or the various services it connects to. All spots and alerts are "timed out" and deleted from the system after a set interval, which by default is one hour for spots and one week for alerts.</p>
     <p>Settings you select from Spothole's menus are sent to the server, in order to provide the data with the requested filters. They are also stored in your browser's local storage, so that your preferences are remembered between sessions.</p>
     <p>There are no trackers, no ads, and no cookies.</p>
+    {% if len(web_ui_options["support-button-html"]) > 0 %}
+        <p><strong>Caveat: </strong> The owner of this server has chosen to inject their own content into the "spots" page. This is designed for a "donate" or "support this server" button. The functionality of this injected content is the responsibility of the server owner, rather than the Spothole software.</p>
+    {% end %}
     <p>Spothole is open source, so you can audit <a href="https://git.ianrenton.com/ian/spothole">the code</a> if you like.</p>
     <h2 class="mt-4">Thanks</h2>
     <p>This project would not have been possible without those volunteers who have taken it upon themselves to run DX clusters, xOTA programmes, DXpedition lists, callsign lookup databases, and other online tools on which Spothole's data is based.</p>