index.html: add Doxygen link

doc/man/index.html

@@ -19,7 +19,8 @@
   <h2>Binaries (section 1)</h2>
   <a href="notcurses-demo.1.html">notcurses-demo</a>—shows off some notcurses features<br/>
   <a href="notcurses-input.1.html">notcurses-input</a>—reads and decodes input events<br/>
-  <a href="notcurses-planereel.1.html">notcurses-ncreel</a>—experiments with ncreels<br/>
+  <a href="notcurses-ncreel.1.html">notcurses-ncreel</a>—experiments with ncreels<br/>
+  <a href="notcurses-pydemo.1.html">notcurses-pydemo</a>—validates the Python wrappers<br/>
   <a href="notcurses-tester.1.html">notcurses-tester</a>—unit test driver<br/>
   <a href="notcurses-view.1.html">notcurses-view</a>—renders images and video to the terminal<br/>
   <h2>C library (section 3)</h2>
@@ -41,7 +42,8 @@
   <a href="notcurses_selector.3.html">notcurses_selector</a>—high-level widget for selecting from a set<br/>
   <a href="notcurses_stats.3.html">notcurses_stats</a>—notcurses runtime statistics<br/>
   <a href="notcurses_stdplane.3.html">notcurses_stdplane</a>—acquire the standard <tt>ncplane</tt><br/>
-  <a href="notcurses_stop.3.html">notcurses_stop</a>—shutdown<br/>
+  <a href="notcurses_stop.3.html">notcurses_stop</a>—collapse the context<br/>
+  <h2>also available: <a href="html/index.html">Doxygen</a></h2>
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