index.html: add link to notcurses-direct-pydemo.1

doc/man/index.html

@@ -31,6 +31,7 @@
   <h2>Binaries (section 1)</h2>
   <a href="ncneofetch.1.html">ncneofetch</a>—generate low-effort posts for r/unixporn<br/>
   <a href="notcurses-demo.1.html">notcurses-demo</a>—shows off some notcurses features<br/>
+  <a href="notcurses-direct-pydemo.1.html">notcurses-direct-pydemo</a>—validates the Python direct-mode wrappers<br/>
   <a href="notcurses-input.1.html">notcurses-input</a>—reads and decodes input events<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/>