rename boards to cards

[wwall3r]

resolves #21

If you check this out:

npx supabase db reset
./scripts/data.sh load

• Go to Running Man game
• Make new card
• Click Card
• Do stuff

[wwall3r]

Bash history, because this was clean af.

 2054  find src/ | rg -i board
 2055  git mv src/lib/db/boards.ts src/lib/db/cards.ts
 2056  git mv src/routes/boards/ src/routes/cards
 2057  git mv src/routes/cards/\[boardId\]/ src/routes/cards/\[cardId\]/
 2060  git mv src/lib/BoardMini.svelte src/lib/CardMini.svelte
 2061  find src/ | rg -i board
 2065  rg -l board src supabase/migrations/ supabase/seed_data/ | xargs sed -i 's#board#card#g'
 2066  rg -l Board src supabase/migrations/ supabase/seed_data/ | xargs sed -i 's#Board#Card#g'

[jaystile]

Great job, Will! Very clean. I rebased from master with my objective_pack changes. I'm merging this in.