Add "Playing It Safe" draft and improve type-checking

- Remove most type assertions and improve types
- Validate wordCount property
- Add "Vore Day" tag
- Add licenses

astro.config.mjs

@@ -15,8 +15,6 @@ export default defineConfig({
   ],
   markdown: {
     smartypants: false,
-    // Remove this line once @astropub/md@0.5.0 lands
-    syntaxHighlight: false,
   },
   build: {
     assets: "assets",