Document "install-assets" makefile target

Also, remove instructions to run bin/snis_update_assets.sh
after "make install"

Signed-off-by: Stephen M. Cameron <stephenmcameron@gmail.com>

index.html

@@ -2356,7 +2356,9 @@ <h2><a name="misctopics">Miscellaneous Development Topics</a></h2>
 <ul>
 <li><cmd>make mostly-clean</cmd>
 <li><cmd>make DESTDIR= PREFIX=/usr/local</cmd>
+<li><cmd>make DESTDIR= PREFIX=/usr/local update-assets</cmd>
 <li><cmd>sudo make DESTDIR= PREFIX=/usr/local install</cmd>
+<li><cmd>sudo make DESTDIR= PREFIX=/usr/lcoal install-assets</cmd>
 </ul>
 <p>Note that <cmd>DESTDIR</cmd> is <cmd>.</cmd> by default, so you must specify <cmd>DESTDIR=</cmd>
 if you want it to really land in <cmd>/usr/local</cmd>.
@@ -2373,9 +2375,6 @@ <h2><a name="misctopics">Miscellaneous Development Topics</a></h2>
 each player have their own computer, and since the game uses OpenGL, you're not going to log
 in remotely and try to run the game with X windows over the network, so there's no good
 reason to <cmd>make install</cmd> as root.
-<p>Additionally, if you do e.g. <cmd>make DESTDIR= PREFIX=$HOME/snis install</cmd> then you
-must also do <cmd>cd $HOME/snis; bin/snis_update_assets.sh</cmd> to get updated assets
-(the Makefile doesn't know about these new assets so it can't install them).
 <p>Also, <cmd>snis_launcher</cmd> will be installed in the bin subdirectory rather than
 at the top level, so to run it, do: <cmd>cd $HOME/snis ; bin/snis_launcher</cmd>.
 <li>If you want to hack on the game, have a look at