move the older 13th Age and Cypher System stuff for Adventuring!

these were both in the homebrew setting that never got off the ground.
these were replaced with a Forgotten Realms-based Cypher System game,
which is soon to be moved to 13th Age 2e, so I'm cleaning up the old
stuff before I figure out what to do with the current (soon old) stuff

pages/13th-age/index.md

@@ -8,20 +8,6 @@ This page, and the pages under it, collect a variety of campaign notes, characte
 bits, and whatever else I end up dropping here for usage by me and my players, but if any of this is
 of interest to you as a random passerby, feel free to use it.
 
-## Adventuring!
-
-[Adventuring!](adventuring/) is a quasi-campaign setting world thing built from nothing but a table of creative people
-and the 13th Age system. It does *not* use the Dragon Empire, or any other setting material, and not even the icons from
-13th Age. It does instead borrow from a variety of tropes, cultural references, etc. It is, as such, the primary force
-of creation behind [Yacsra](yacsra/).
-
-## Yacsra
-
-The world of [Yacsra](yacsra/), bss's *yet another campaign setting, roughly assembled*, is a
-general purpose campaign setting, with a design inspired by the Dragon Empire, 13th Age's deliberately open-ended
-meta-setting. It takes cues (e.g. 13 icons, points of light, etc.) but is made up of unique icons, places, etc.
-The material that I've written or that my tables have come up with off the cuff build upon the lore of Yacsra.
-
 ## House Rules
 
 I don't consider myself much of a game designer, but nonetheless I have added
@@ -32,15 +18,15 @@ event I reuse them or they are useful to someone else.
 * [Influence Points](influence-points)
 * [Items](items)
 
-## Characters
+## Legacy Stuff
+
+### Characters
 
 Characters I've made for other campaigns:
 
 * [Valon Amarathar](valon-amarathar) — for Alex's campaign, Seven Rings
 
-## Legacy Stuff
-
-### Former Campaigns in the World of Yacsra
+### Former Campaigns
 
 The following campaigns are shelved at the moment, but may return in some form:
 
@@ -48,8 +34,7 @@ The following campaigns are shelved at the moment, but may return in some form:
 * [Crimson](crimson/)
 * [Verdant Dawn](verdant-dawn/)
 
-Currently-lost campaigns, before I started organizing things here under Yacsra, that nevertheless
-influenced it, or at least me:
+Currently-lost campaigns, before I started organizing things here, that nevertheless influenced it, or at least me:
 
 * Sins of the Past, a time- and dimension-spanning Shadowrun-y 13th Age game that eventually became
   traditional fantasy anyway