lots of updates

add ecnounter alpha
pull out astral travel to own file
zine prep
fix multi-row table headers

src/pages/bestiary/index.md

@@ -24,6 +24,7 @@ Below you'll find a small sampling of the various humanoids and other creatures
 -   [Flicker Dog](./flicker-dog.html): An intelligent, aloof, and often friendly wolf-like hound native to the Feywolde that hunt in packs and appear to flicker in and out of existence.
 -   [Horse](./horses/): A four-legged herd animal with a long head, often domesticated and used for transportation or agriculture.
 -   [Knight](./knight.html): A cavalier with a code, often found mounted and on a quest.
+-   [Megatherium](./megatherium.html): Giant, peaceful ground sloth.
 -   [Mimic](./mimic.html): A shape-shifter that can assume the form of inanimate objects (ex: chests, statues, or doors).
 -   [Minotaur](./minotaur.html): Large, aggressive humanoid with a bull head and a propensity for labyrinths.
 -   [Mule](./mule.html): A horse / donkey hybrid used as a beast of burden.