move 13th age pages from bss.zone to here

pages/13th-age/yacsra/index.md

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+Title:          Yacsra
+Description:    The places, people, and etc. of Yacsra, bss's yet another campaign setting, roughly
+                assembled, for the 13th Age roleplaying game.
+
+# Yacsra
+
+Yacsra is my *yet another campaign setting, roughly assembled*. Made to organize elements of my
+various 13th Age games, its exact theme and purpose is malleable and inspecific, subject to my and
+my players' whims, and no more exact than whatever interesting thing comes our way. That said, the
+goal is that certain established (for now...) truths are catalogued here for reference or usage in
+other campaigns.
+
+## The Icons
+
+13th Age's thirteen icons are the current icons of Yacsra. The following details have been given to
+certain icons; any omitted icons or details follow the base game.
+
+* Elia, the Grey Witch (The Lich King)
+
+## Other People
+
+## Places