Improve some error handling. Closes #150

templates/help/about.html

@@ -0,0 +1,20 @@
+{% extends "help_page.html" %}
+{% block help_content %}
+
+    <h2 class="mt-4 mb-4">About Spothole</h2>
+    <p>Spothole is a utility to aggregate "spots" from amateur radio DX clusters and xOTA spotting sites, and provide an
+        open JSON API as well as a website to browse the data.</p>
+    <p>While there are several other web-based interfaces to DX clusters, and sites that aggregate spots from various
+        outdoor activity programmes for amateur radio, Spothole differentiates itself by supporting a larger number of
+        data sources, and by being "API first" rather than just providing a web front-end. This allows other software to
+        be built on top of it.</p>
+    <p>The API is deliberately well-defined with an <a href="/apidocs/openapi.yml">OpenAPI specification</a> and <a
+            href="/apidocs">API documentation</a>. The API delivers spots in a consistent format regardless of the data
+        source, freeing developers from needing to know how each individual data source presents its data.</p>
+    <p>Spothole itself is also open source, Public Domain licenced code that anyone can take and modify. <a
+            href="https://git.ianrenton.com/ian/spothole/">The source code is here</a>.</p>
+    <p>The software was written by <a href="https://ianrenton.com">Ian Renton, MØTRT</a> with code contributions by
+        Steven, M1SDH. The full list of thanks due to others can be found at the bottom of this page.</p>
+    <p>This server is running Spothole version {{software_version}}.</p>
+
+{% end %}