New index to all troggle pages

handbook/troggle/trogsimpler.html

@@ -142,7 +142,7 @@ more modern look there as well
 [The effort estimate is similarly a gross underestimate because (a)  he assumes one script per page of output, forgetting all the core work to create a central consistent dataset, and (b) he is missing out most 
 of the functionality we use without realizing it because it is built into 
 django's SQL system, such as multi-user operations.
-<p><span style="color:red">Eventually we will have to <a href="trogdesignx.html">migrate from django</a> of course</span>, as it will eventually
+<p><span style="color:red">Eventually we will have to <a href="trogdesign.html">migrate from django</a> of course</span>, as it will eventually
 fail to keep up with the rest of the world. Right now we need to get ourselves onto python3
 so that we can use an LTS release which has current security updates. This is 
 <a href="https://docs.djangoproject.com/en/3.0/internals/release-process/#supported-versions-policy">more urgent for django</a> than for Linux. In Ubuntu terms we are on 18.04 LTS (Debian 10) which has no free maintenance updates from 2023. <span style="color:red">We should plan to migrate troggle from django to another framework in about 2025. See stroggle below.</span>]
@@ -170,8 +170,11 @@ We need a file uploading system to put things in the right place; and this would
 
 
 <hr />
-Go on to: <a href="trogarch.html">Troggle architecture</a><br />
 Return to: <a href="trogdesign.html">Troggle design and future implementations</a><br />
+Return to: <a href="trogintro.html">Troggle intro</a><br />
+Troggle index: 
+<a href="trogindex.html">Index of all troggle documents</a><br />
+
 <hr />
 </body>
 </html>