manuscript - introduction

[harryhoch]

Add link to hubverse at the end of the introduction.

[eahowerton]

I've used the following link: https://hubdocs.readthedocs.io/en/latest/index.html. @nickreich @elray1 is this the primary link we are using? Or should I use something different or add an additional link?

[elray1]

I think that's the right link.