Add an about page to docs site

[larowlan]

It would be good to add an about page to the docs site detailing things like:

• who is behind the project
• security policy (i.e. how security issues should be handled)
• logos of companies that use it

This will help to

• increase trust in the service that by design can dynamically rewrite packages
• lead to increase visibility and popularity of the project

[apellerano-pw]

I agree; my big questions are:

1. What is the supply chain for GitPkg? Is it a redirect service for tarballs provided by GitHub? Does it provide a CDN over GitHub's tarballs? Does it create & host the tarballs itself?
2. Who is paying for the traffic?
3. What is considered unreasonable use of the system?

I did find this high-level description in the docs: https://gitpkg.vercel.app/guide/#advanced-how-this-function-is-implemented