Add new /software page

There are links out there to this page that would have resulted in
404 errors. This page is a placeholder that simply provides links to
the /programs and /codelib pages. This page is not linked from the
main menu, but has been added to the sitemap.

Fixes #63

Author: delphidabbler

sitemap.xml

@@ -56,6 +56,11 @@
   <lastmod>2021-10-09T10:00:00+00:00</lastmod>
   <priority>0.60</priority>
 </url>
+<url>
+  <loc>https://delphidabbler.com/software/</loc>
+  <lastmod>2021-12-09T13:24:00+00:00</lastmod>
+  <priority>0.50</priority>
+</url>
 <url>
   <loc>https://delphidabbler.com/software/codesnip</loc>
   <lastmod>2021-10-09T10:00:00+00:00</lastmod>

software.html

@@ -0,0 +1,19 @@
+---
+title: Software
+---
+<h1 role="heading">Software</h1>
+
+<p>There are two main types of software available from this site, each accessible from their own page:</p>
+
+<ul class="list-group">
+    <a href="/programs" class="list-group-item list-group-item-action">
+        <h2>Applications</h2>
+        <p class="xindent">Numerous applications are available. All are open source.</p>
+    </a>
+    <a href="/codelib" class="list-group-item list-group-item-action">
+        <h2>DelphiDabbler Code Library</h2>
+        <p class="xindent">Various open source Delphi components, classes and some IDE extensions</p>
+    </a>
+</ul>
+
+<p>Click either box above to go to the relevant page.</p>