fixup link to visual6502 wiki

expert.html

@@ -56,7 +56,7 @@ $().ready(function(){
 <a href="http://blog.visual6502.org">Blog</a>&nbsp;
 <a href="http://www.visual6502.org/links.html">Links</a>&nbsp;
 <a href="http://github.com/trebonian/visual6502">Source</a>&nbsp;
-<a href="http://skilldrick.github.com/easy6502/#first-program">easy6502 assembler</a>&nbsp;
+<a href="http://skilldrick.github.io/easy6502/#first-program">easy6502 assembler</a>&nbsp;
 <a href="http://www.masswerk.at/6502/disassembler.html">mass:werk disassembler</a>&nbsp;
 </span>
 <div class="frame" id="frame">
@@ -115,7 +115,7 @@ $().ready(function(){
     <a href ="javascript:goFor()"><img class="navbutton" src="images/fastforward.png" title="fastforward"></a>
   </div>
   <div style="float:right;">
-    <a href="http://visual6502.org/wiki/index.php?title=JssimUserHelp" target="_blank">User Guide</a>
+    <a href="https://web.archive.org/web/20210608195625/http://visual6502.org/wiki/index.php?title=JssimUserHelp" target="_blank">User Guide</a>
     &nbsp;
   </div>
 </div>  <!-- buttons -->

index.html

@@ -66,7 +66,7 @@ Keyboard controls: 'z' to zoom in, 'x' to zoom out, 'n' to step the simulation.
 <br />
 Mouse controls: Left-click and drag to scroll around (when you're zoomed in.)
 <br />
-More information in the <a href="http://visual6502.org/wiki/index.php?title=JssimUserHelp">User Guide</a>.
+More information in the <a href="https://web.archive.org/web/20210608195625/http://visual6502.org/wiki/index.php?title=JssimUserHelp">User Guide</a>.
 <br />
 <br /> 
 </span>
@@ -97,7 +97,7 @@ More information in the <a href="http://visual6502.org/wiki/index.php?title=Jssi
 <br />
 <br />
 Source code is available on <a href="http://github.com/trebonian/visual6502">github visual6502</a>.
-Use the online <a href="http://skilldrick.github.com/easy6502/#first-program">emulator and assembler</a> from the easy6502 tutorial
+Use the online <a href="https://skilldrick.github.io/easy6502/#first-program">emulator and assembler</a> from the easy6502 tutorial
 and <a href="http://www.masswerk.at/6502/disassembler.html">disassembler</a> from mass:werk
 <br />
 For in-depth 6502 investigation and some more advanced features, try our <a href="expert.html">Advanced</a> page.