move some old 13th Age 1e stuff aside

pages/13th-age/index.md

@@ -14,8 +14,6 @@ I don't consider myself much of a game designer, but nonetheless I have added
 some house rules and items and so on to the game. I will try to catalog them here, just in the
 event I reuse them or they are useful to someone else.
 
-* [bss's Toughness](bss's-toughness)
-* [Influence Points](influence-points)
 * [Items](items)
 
 ## Legacy Stuff
@@ -39,3 +37,10 @@ Currently-lost campaigns, before I started organizing things here, that neverthe
 * Sins of the Past, a time- and dimension-spanning Shadowrun-y 13th Age game that eventually became
   traditional fantasy anyway
 * Shards of Jade II, an especially off the rails adventurer mischief sandbox
+
+### House Rules
+
+These were fine... for 1e.
+
+* [bss's Toughness](bss's-toughness)
+* [Influence Points](influence-points)