build: add the command to generate docs on local environments

Author: takker99

deno.jsonc

@@ -19,6 +19,7 @@
     "type-check": "deno check --remote **/*.ts",
     "test": "deno test --allow-read=./ --doc --parallel --shuffle --no-check",
     "coverage": "deno test --allow-read=./ --parallel --shuffle --coverage --no-check && deno coverage --html",
+    "doc": "deno doc --html mod.ts",
     // from https://github.com/jsr-core/unknownutil/blob/v4.2.2/deno.jsonc#L84-L85
     "update": "deno outdated --update",
     "update:commit": "deno task -q update --commit --prefix deps: --pre-commit=fix"
@@ -60,7 +61,8 @@
     ]
   },
   "exclude": [
-    "coverage/"
+    "coverage/",
+    "docs/"
   ],
   "lint": {
     "exclude": [