docs: add starter mdx posts

content/posts/starter-mdx-showcase.mdx

@@ -0,0 +1,73 @@
+---
+title: "Starter MDX Showcase"
+date: "2026-06-03"
+excerpt: "Sample starter content demonstrating math, local images, links, tables, tasks, and code blocks for validating blog routes."
+tags:
+  - Design
+  - Next.js
+  - Math
+  - Code
+  - Web Dev
+author: "Starter Content"
+coverImage: "/starter-showcase.svg"
+---
+
+This is deliberately sample content for a fresh blog. Replace it with your own writing once the routes, tags, and search experience are validated.
+
+![Abstract gradient card used as a local starter cover](/starter-showcase.svg)
+
+## What this post covers
+
+- A local image from `public/` referenced with an absolute path.
+- Links to [Next.js](https://nextjs.org/) and an internal [tag page](/tags/web-dev/).
+- GFM tables, task lists, blockquotes, code fences, and math.
+
+> Starter posts should be easy to delete, but rich enough to prove the publishing pipeline works end to end.
+
+## Markdown and GFM examples
+
+| Feature | Purpose | Status |
+| --- | --- | --- |
+| Tags | Builds static tag pages | Ready |
+| Math | Checks KaTeX rendering | Ready |
+| Code | Checks syntax highlighting | Ready |
+
+- [x] Confirm route generation has at least one post.
+- [x] Confirm spaced tags such as **Web Dev** create usable params.
+- [ ] Replace this demo with a real article.
+
+Inline code like `generateStaticParams` should be readable inside a sentence, and inline math such as $E = mc^2$ should render without extra setup.
+
+Display math is useful for longer equations:
+
+$$
+\operatorname{score}(post) = \frac{links + images + code}{reading\ time}
+$$
+
+## Code with title and highlighted lines
+
+```tsx title="components/example-card.tsx" {2,6-8}
+type ExampleCardProps = {
+  title: string
+  href: string
+}
+
+export function ExampleCard({ title, href }: ExampleCardProps) {
+  return <a href={href}>{title}</a>
+}
+```
+
+## Lists, links, and details
+
+1. Draft the article in MDX.
+2. Add concrete examples and screenshots.
+3. Link to useful references, such as the [MDX docs](https://mdxjs.com/).
+
+<details>
+  <summary>Why keep demo content obvious?</summary>
+  <p>Because starter posts are fixtures for validation, not permanent editorial content.</p>
+</details>
+
+## Closing note
+
+This post intentionally exercises common authoring features so the owner can validate static post routes, tag pages, and future search indexing with realistic but replaceable content.