Create general “content/documentation page” component/template

[samajammin]

Similar to a homepage/landing page (#55) we plan to create some standalone documentation pages to provide additional information to users.

Let's create a template component that we can use to create web pages via markdown files

Design is neeed here but in the meantime we could build out the functionality to create pages based off markdown files,
e.g. by adding a src/pages/about.md file or src/pages/about/index.md, this would create a webpage accessible at https://maci-rpgf.vercel.app/about

For a general layout, I'm thinking something simple like:
https://maci.pse.dev/roadmap

Nice to have

• Table of contents along the right sidebar
• Linkable headers (e.g. like https://maci.pse.dev/roadmap#1-maci-developer-experience-dx)

[kittybest]

Some possible package we could use:
https://nextjs.org/learn-pages-router/basics/dynamic-routes/render-markdown