[base-shrines] Fixes and p5 shrines

Fixed some of the `push:` nouns and added a `Hibarnhvidar:` section for P5.  It's incomplete still but adding what I've got so far.

data/base-shrines.yaml

@@ -172,7 +172,7 @@ shrines:
     push: altar
   - location: Berengaria's stone shrine
     start_room: 2867
-    push: altar
+    push: shrine
   - location: The rebirth altar in the Temple of Light
     start_room: 11381
     push: altar
@@ -194,3 +194,19 @@ shrines:
   - location: A purple osage heartwood altar at Horse Clan
     start_room: 6366
     push: altar
+  Hibarnhvidar:
+  - location: Traveler's Shrine, Hibarnhvidar
+    start_room: 15867
+    push: altar
+  - location: Albreda's Shrine, Hibarnhvidar
+    start_room: 15872
+    push: altar
+  - location: The central altar of the Temple of Kertigen
+    start_room: 3867
+    push: altar
+  - location: A peregan tree altar at Boar Clan
+    start_room: 11756
+    push: altar
+  - location: Divyaush's slab in an abandoned mine
+    start_room: 4397
+    push: slab