fix some filenames

site/index.html

@@ -41,7 +41,7 @@
     Sitix renders <b>what you want, when you want it,</b> and doesn't ask questions.
 </div>
 <div class="text plug">
-    Like what you see? <a href="[^baseurl]/pages/install">install Sitix</a> and start building modern websites now!
+    Like what you see? <a href="[^baseurl]/pages/install.html">install Sitix</a> and start building modern websites now!
 </div>
 [/]
 [#templates/default.html]

site/pages/install.html

@@ -13,7 +13,7 @@
     Microsoft doesn't deserve it.
 </div>
 <div class="text">
-    Once you've got Sitix installed, see <a href="[^baseurl]/pages/usage">Usage</a>.
+    Once you've got Sitix installed, see <a href="[^baseurl]/pages/usage.html">Usage</a>.
 </div>
 [/]
 [#templates/default.html]

site/pages/usage.html

@@ -3,7 +3,7 @@
 [=isSimple ]
 [=content-]
 <div class="text">
-    Sitix is a KISS program, so there's not a lot of setup. Once you've got it installed (see <a href="[^baseurl]/pages/install">for information on that</a>),
+    Sitix is a KISS program, so there's not a lot of setup. Once you've got it installed (see <a href="[^baseurl]/pages/install.html">for information on that</a>),
     you need a project to build. The simplest Sitix project structure is just a <code>site</code> folder, which contains the actual Sitix "scripts". When
     (you absolutely must be outside of the site directory to do this!) you run <code>sitix site</code>, Sitix will delete the <code>output</code> directory
     and all contents, if it exists, and then create a new <code>output</code> directory for the compiled site code. Then, Sitix will walk down the tree of

site/templates/default.html

@@ -61,7 +61,7 @@
                 Sitix is still young and probably buggy; if you have issues, submit a bug report at <a href="https://github.com/LinuxRocks2000/sitix-rewrite/issues">
                     the issues page
                 </a> or contact me at <a href="mailto:plupy44@gmail.com">plupy44@gmail.com</a> (github issue preferred).<br>
-                If you want to contribute, but don't know where to start, see <a href="[^baseurl]/pages/todo">The Todo List</a>.
+                If you want to contribute, but don't know where to start, see <a href="[^baseurl]/pages/todo.html">The Todo List</a>.
             </div>
         </div>
         <div id="actualbottom">Site designed by Tyler Clarke and built with Sitix. This page uses the <a href="https://www.latofonts.com/lato-free-fonts/">Lato fonts</a>.</div>