vic20: added to platforms menu, fix joystick in chips wasm (it's a submodule now)

.gitmodules

@@ -13,3 +13,6 @@
 [submodule "nanoasm"]
 	path = nanoasm
 	url = https://github.com/8bitworkshop/nanoasm
+[submodule "chips"]
+	path = chips
+	url = ./chips

index.html

@@ -168,6 +168,7 @@ body {
                <li><a class="dropdown-item" href="?platform=apple2">Apple ][+</a></li>
                <li><a class="dropdown-item" href="?platform=zx">ZX Spectrum</a></li>
                <li><a class="dropdown-item" href="?platform=cpc.6128">Amstrad CPC6128</a></li>
+               <li><a class="dropdown-item" href="?platform=vic20">VIC-20</a></li>
               </ul>
           </li>
           <li class="dropdown dropdown-submenu">