add par and alt examples to index.html

dist/index.html

@@ -30,7 +30,18 @@ Bob--x Alice: I am good thanks!
 Bob-x John: I am good thanks!
 Note right of John: Bob thinks a long<br/>long time, so long<br/>that the text does<br/>not fit on a row.
 Bob-->Alice: Checking with John...
-Alice->John: Yes... John, how are you?
+alt either this
+Alice->>John: Yes
+else or this
+Alice->>John: No
+else or this will happen
+Alice->John: Maybe
+end
+par this happens in parallel
+Alice -->> Bob: Parallel message 1
+and 
+Alice -->> John: Parallel message 2
+end
   </div>
 
   <hr/>