Make the root URL do something useful

[MatMoore]

Split from #20

Currently, the root URL (i.e. http://localhost:8000/) returns a 404 which is probably going to be confusing.

Can we redirect that to the docs, or put in an HTML landing page?

fastapi/fastapi#199 has an example of how to do redirects in FastAPI

For a landing page I think we can follow https://fastapi.tiangolo.com/tutorial/static-files/

Some ideas for things we could put on a landing page:

• A link to github, maybe like this https://github.blog/2008-12-19-github-ribbons/
• A link to the API documentation
• A simple example of what the API returns

[shiv-io]

Just created a pull request: #23

[andreagrandi]

Just created a pull request: #23

Thanks for the PR!