docs: add tags package to generate tags (#10666)

* initial changes

* finalize implementation

* run generator on prep

* remove tags package from book

* optimization attempt

* test transpile

* test transpile

* rename utils

* rename directory

* add vercel ignore

* add tags to book

www/packages/docs-utils/src/get-front-matter.ts

@@ -0,0 +1,30 @@
+import remarkFrontmatter from "remark-frontmatter"
+import remarkParse from "remark-parse"
+import remarkStringify from "remark-stringify"
+import { unified } from "unified"
+import { read, readSync } from "to-vfile"
+import { matter } from "vfile-matter"
+import { FrontMatter } from "types"
+
+export async function getFrontMatter(filePath: string): Promise<FrontMatter> {
+  return (
+    await unified()
+      .use(remarkParse)
+      .use(remarkStringify)
+      .use(remarkFrontmatter, ["yaml"])
+      .use(() => {
+        return (tree, file) => {
+          matter(file)
+        }
+      })
+      .process(await read(filePath))
+  ).data.matter as FrontMatter
+}
+
+export function getFrontMatterSync(filePath: string): FrontMatter {
+  const content = readSync(filePath)
+
+  matter(content)
+
+  return content.data.matter as FrontMatter
+}