lots of updates

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

src/assets/fragments/bestiary/herd-mammal.md

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+-   Exact species depends on terrain.
+-   In groups of 3+, only 25% are male.
+-   Females and young do not have a butt attack, and will typically try to flee.
+
+### Stampede
+
+Herds of 20+ can stampede, trampling nearly anything in their path.
+
+-   75% chance each round.
+-   +4 to hit humanoid (or smaller) creatures.
+-   Deals 1d20 damage.