Several minor improvements to typing and misc.

- Improved schema validation
- Move username parsing and other validators to schema types
- Fix astro check command
- Add JSON/YAML schema validation for data collections
- Update licenses
- Remove deployment script in favor of rsync
- Prevent unsanitized input in export-story script
- Change "eng" language to "en", per BCP47
- Clean up i18n keys and add aria attributes
- Improve MastodonComments behavior on no-JS browsers

.vscode/extensions.json

@@ -1,3 +1,8 @@
 {
-  "recommendations": ["astro-build.astro-vscode", "bradlc.vscode-tailwindcss", "esbenp.prettier-vscode"]
+  "recommendations": [
+    "astro-build.astro-vscode",
+    "bradlc.vscode-tailwindcss",
+    "esbenp.prettier-vscode",
+    "redhat.vscode-yaml"
+  ]
 }