Feat/rehype-citation (#270)

* feat: add rehype-citation and upgrade to next 12.0.3

* docs: update docs

data/blog/introducing-tailwind-nextjs-starter-blog.mdx

@@ -1,7 +1,7 @@
 ---
 title: 'Introducing Tailwind Nextjs Starter Blog'
 date: '2021-01-12'
-lastmod: '2021-09-08'
+lastmod: '2021-11-14'
 tags: ['next-js', 'tailwind', 'guide']
 draft: false
 summary: 'Looking for a performant, out of the box template, with all the best in web technology to support your blogging needs? Checkout the Tailwind Nextjs Starter Blog template.'
@@ -51,6 +51,7 @@ I wanted it to be nearly as feature-rich as popular blogging templates like [bea
 - [MDX - write JSX in markdown documents!](https://mdxjs.com/)
 - Server-side syntax highlighting with line numbers and line highlighting via [rehype-prism-plus](https://github.com/timlrx/rehype-prism-plus)
 - Math display supported via [KaTeX](https://katex.org/)
+- Citation and biliography support via [rehype-citation](https://github.com/timlrx/rehype-citation)
 - Automatic image optimization via [next/image](https://nextjs.org/docs/basic-features/image-optimization)
 - Flexible data retrieval with [mdx-bundler](https://github.com/kentcdodds/mdx-bundler)
 - Support for tags - each unique tag will be its own page