chore: add doc checker (#2877)

First steps towards #2876
Depends on denoland/std#6632

Author: iuioiua

.github/workflows/ci.yml

@@ -50,3 +50,6 @@ jobs:
 
       - name: Run tests
         run: deno task test
+
+      - name: Check docs
+        run: deno task check:docs

deno.json

@@ -22,6 +22,7 @@
     "build-www": "deno task --cwd=www build",
     "screenshot": "deno run -A www/utils/screenshot.ts",
     "check:types": "deno check src/**/*.ts src/**/*.tsx tests/**/*.ts tests/**/*.tsx update/**/*.ts plugin-tailwindcss/**/*.ts init/**/*.ts",
+    "check:docs": "deno run -A tools/check_docs.ts",
     "ok": "deno fmt --check && deno lint && deno task check:types && deno task test",
     "test:www": "deno test -A www/main_test.*",
     "release": "deno run -A tools/release.ts"
@@ -40,6 +41,8 @@
     "exclude": ["**/*_test.*", "src/__OLD/**", "*.todo"]
   },
   "imports": {
+    "@deno/doc": "jsr:@deno/doc@^0.172.0",
+    "@std/collections": "jsr:@std/collections@^1.0.11",
     "@std/http": "jsr:@std/http@^1.0.15",
     "fresh": "jsr:@fresh/core@^2.0.0-alpha.26",
     "preact": "npm:preact@^10.25.1",